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All questions of Light, Shadow and Reflections for Class 6 Exam
What is formed when an opaque object blocks the path of light?- a)Reflection
- b)Refraction
- c)Shadow
- d)Image
Correct answer is option 'C'. Can you explain this answer?
a)
Reflection
b)
Refraction
c)
Shadow
d)
Image
|
Praveen Kumar answered |
When light is blocked by an opaque object, a shadow is formed on the opposite side of the light source.
Study the set-up below. 
How will the shadow look like?- a)
- b)
- c)
- d)
Correct answer is option 'C'. Can you explain this answer?
Study the set-up below.
How will the shadow look like?
a)
b)
c)
d)
|
Ananya Das answered |
Book is an opaque object and hence does not allow the light of torch to pass through it. As there is no light on the ring, hence no image will be formed and the screen will remain dark due to absence of any light ray.
Geeta placed three objects made of different materials as shown in the figure. She observed a bright spot of light at (II) but (III) would not get any spot.-Then,
- a)(I) and (II) are made of transparent materials and (III) is made of opaque material.
- b)(I) is made of transparent material, (II) is made of translucent material and (III) is made of opaque material.
- c)(I) is made of transparent material, (II) is made of opaque material and (III) is made of either transparent or opaque or translucent material.
- d)(I) and (II) are made of opaque material and (III) is made of transparent material.
Correct answer is option 'C'. Can you explain this answer?
Geeta placed three objects made of different materials as shown in the figure. She observed a bright spot of light at (II) but (III) would not get any spot.-Then,
a)
(I) and (II) are made of transparent materials and (III) is made of opaque material.
b)
(I) is made of transparent material, (II) is made of translucent material and (III) is made of opaque material.
c)
(I) is made of transparent material, (II) is made of opaque material and (III) is made of either transparent or opaque or translucent material.
d)
(I) and (II) are made of opaque material and (III) is made of transparent material.
|
Subham Nair answered |
Transparent material allows light to pass through it and opaque object obstructs it.
A girl is 4 m away from the plane mirror. If she moves few steps closer to the mirror, what will happen to the image size in the mirror? 
- a)The size of image will decrease.
- b)The size of image will increase.
- c)The size of image will be the same.
- d)Cannot say.
Correct answer is option 'C'. Can you explain this answer?
A girl is 4 m away from the plane mirror. If she moves few steps closer to the mirror, what will happen to the image size in the mirror?
a)
The size of image will decrease.
b)
The size of image will increase.
c)
The size of image will be the same.
d)
Cannot say.
|
Anoushka Banerjee answered |
The image formed in the plane mirror is always of the same size as that of the object.
Three sticks are placed in an open field as shown in figure. Which of the following sticks will form the shadow of equal length? 
- a)Only sticks (I) and (II)
- b)Only sticks (II) and (III)
- c)Only sticks (I) and (III)
- d)All sticks (I), (II) and (III).
Correct answer is option 'C'. Can you explain this answer?
Three sticks are placed in an open field as shown in figure. Which of the following sticks will form the shadow of equal length?
a)
Only sticks (I) and (II)
b)
Only sticks (II) and (III)
c)
Only sticks (I) and (III)
d)
All sticks (I), (II) and (III).
|
Gopal Ghoshal answered |
The length of the shadow changes according to the position of the source of light, i.e., the sun with respect to the object.
The diagram shows an object O viewed using two mirrors. A person looks into the mirrors as shown. At which position is the image of O seen? 
- a)a
- b)b
- c)c
- d)d
Correct answer is option 'D'. Can you explain this answer?
The diagram shows an object O viewed using two mirrors. A person looks into the mirrors as shown. At which position is the image of O seen?
a)
a
b)
b
c)
c
d)
d
|
Arjun Desai answered |
1) Consider the object O and the mirror at the top...
Which of the following statements is true about shadows?- a)They are always colored
- b)They are always smaller than the object
- c)They can change size and shape
- d)They are formed only during the day
Correct answer is option 'C'. Can you explain this answer?
a)
They are always colored
b)
They are always smaller than the object
c)
They can change size and shape
d)
They are formed only during the day
|
Vp Classes answered |
Shadows can vary in size and shape depending on the position and distance of the light source relative to the object.
Which of the following is a natural source of light?- a)Candle
- b)Sun
- c)Electric bulb
- d)Torch
Correct answer is option 'B'. Can you explain this answer?
a)
Candle
b)
Sun
c)
Electric bulb
d)
Torch
|
Dr Manju Sen answered |
The Sun is a natural source of light, while candles, electric bulbs, and torches are artificial sources.
Which of the following materials is best suited for making a pinhole camera?- a)Transparent plastic
- b)Cardboard box
- c)Metal sheet
- d)Glass jar
Correct answer is option 'B'. Can you explain this answer?
a)
Transparent plastic
b)
Cardboard box
c)
Metal sheet
d)
Glass jar
|
|
Vp Classes answered |
A cardboard box is opaque and easy to manipulate, making it ideal for constructing a pinhole camera.
What happens to the size of a shadow when the light source is moved closer to the object?- a)It becomes larger
- b)It becomes smaller
- c)It remains the same
- d)It disappears
Correct answer is option 'A'. Can you explain this answer?
a)
It becomes larger
b)
It becomes smaller
c)
It remains the same
d)
It disappears
|
Coachify answered |
As the light source moves closer, the shadow enlarges due to the increased divergence of light rays.
Which of the following is NOT an example of a luminous object?- a)Sun
- b)Firefly
- c)Moon
- d)Lit candle
Correct answer is option 'C'. Can you explain this answer?
a)
Sun
b)
Firefly
c)
Moon
d)
Lit candle
|
Nilanjan Unni answered |
Luminous vs. Non-Luminous Objects
Luminous objects are those that emit light on their own. In contrast, non-luminous objects do not produce light; instead, they reflect light from luminous sources. Let's analyze the options provided:
Examples of Luminous Objects:
- Sun: The Sun is a massive ball of gas that generates light through nuclear fusion. It is the primary source of light for our solar system.
- Firefly: Fireflies are insects that produce light through a chemical reaction in their bodies. This natural phenomenon is known as bioluminescence.
- Lit Candle: A lit candle emits light due to the combustion of wax. The flame produces a bright glow, making it luminous.
Why the Moon is Non-Luminous:
- Moon: The Moon does not produce its own light. Instead, it reflects light from the Sun. When we see the Moon shining in the night sky, we are actually seeing sunlight that is bouncing off its surface.
Conclusion:
In summary, the correct answer is option 'C' (Moon) because it is a non-luminous object. The Moon's brightness is a result of reflecting sunlight, while the Sun, firefly, and lit candle are all examples of luminous objects that emit their own light. Understanding the distinction between these types of objects is crucial in studying light and its sources.
Luminous objects are those that emit light on their own. In contrast, non-luminous objects do not produce light; instead, they reflect light from luminous sources. Let's analyze the options provided:
Examples of Luminous Objects:
- Sun: The Sun is a massive ball of gas that generates light through nuclear fusion. It is the primary source of light for our solar system.
- Firefly: Fireflies are insects that produce light through a chemical reaction in their bodies. This natural phenomenon is known as bioluminescence.
- Lit Candle: A lit candle emits light due to the combustion of wax. The flame produces a bright glow, making it luminous.
Why the Moon is Non-Luminous:
- Moon: The Moon does not produce its own light. Instead, it reflects light from the Sun. When we see the Moon shining in the night sky, we are actually seeing sunlight that is bouncing off its surface.
Conclusion:
In summary, the correct answer is option 'C' (Moon) because it is a non-luminous object. The Moon's brightness is a result of reflecting sunlight, while the Sun, firefly, and lit candle are all examples of luminous objects that emit their own light. Understanding the distinction between these types of objects is crucial in studying light and its sources.
A solid transparent sphere has a small opaque dot at its centre. When observed from outside, the apparent position of the dot will be- a)Closer to the eye than its actual position.
- b)The same as its actual position.
- c)Farther away from the eye than its actual position.
- d)None of these.
Correct answer is option 'B'. Can you explain this answer?
A solid transparent sphere has a small opaque dot at its centre. When observed from outside, the apparent position of the dot will be
a)
Closer to the eye than its actual position.
b)
The same as its actual position.
c)
Farther away from the eye than its actual position.
d)
None of these.
|
Siddharth Chavan answered |
As u = 
⇒ v = −R
Read the given statements and select the correct option,
Statement 1: Rahul placed a colored plastic bottle in front of the beam of a torch light. Then he placed a transparent sheet of same size on the other side of bottle. No shadow will form on the screen.
Statement 2: Translucent objects allow light to pass through them partially. - a)Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
- b)Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
- c)Statement 1 is true but statement 2 is false.
- d)Statement 1 is false but statement 2 is true.
Correct answer is option 'D'. Can you explain this answer?
Read the given statements and select the correct option,
Statement 1: Rahul placed a colored plastic bottle in front of the beam of a torch light. Then he placed a transparent sheet of same size on the other side of bottle. No shadow will form on the screen.
Statement 2: Translucent objects allow light to pass through them partially.
Statement 1: Rahul placed a colored plastic bottle in front of the beam of a torch light. Then he placed a transparent sheet of same size on the other side of bottle. No shadow will form on the screen.
Statement 2: Translucent objects allow light to pass through them partially.
a)
Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
b)
Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
c)
Statement 1 is true but statement 2 is false.
d)
Statement 1 is false but statement 2 is true.
|
Upasana Basak answered |
A colored plastic bottle is an opaque material. When a light beam is incident on it, a shadow will form on the screen can easily pass through the transparent material.
Which of the items above will allow you to see around a corner from where you are standing?- a)(i) only
- b)(iii) only
- c)(i) and (ii)
- d)(i) and (iii)
Correct answer is option 'B'. Can you explain this answer?
Which of the items above will allow you to see around a corner from where you are standing?
a)
(i) only
b)
(iii) only
c)
(i) and (ii)
d)
(i) and (iii)
|
Harshad Saha answered |
Figure (iii) is periscope which is used to see around the corners. It is based upon the principle of rectilinear propagation of light and reflection of light.
Which of the following statements is true?
- a)The image formed by a pinhole camera is inverted because light travels in a straight line.
- b)Light does not change its direction on reflection.
- c)As we move the object away from the light source, the shadow of the object becomes smaller.
- d)Reflection is possible only from unpolished surface.
Correct answer is option 'A'. Can you explain this answer?
Which of the following statements is true?
a)
The image formed by a pinhole camera is inverted because light travels in a straight line.
b)
Light does not change its direction on reflection.
c)
As we move the object away from the light source, the shadow of the object becomes smaller.
d)
Reflection is possible only from unpolished surface.
|
Rajat Menon answered |
Light changes its direction after reflection. As we move the object away from the light source, the shadow becomes larger as the distance between object and the light source increases. Reflection is possible from rough surface also.
Riya and Priya were sitting around a round table. They noticed that they could see their own and each other's image onto the table top. Then table top is made of- a)Unpolished wood, covered with white cloth
- b)Polished glass of red colour
- c)Glass covered with cellophane paper
- d)Smoked glass covered with green colour cloth.
Correct answer is option 'B'. Can you explain this answer?
Riya and Priya were sitting around a round table. They noticed that they could see their own and each other's image onto the table top. Then table top is made of
a)
Unpolished wood, covered with white cloth
b)
Polished glass of red colour
c)
Glass covered with cellophane paper
d)
Smoked glass covered with green colour cloth.
|
Shruti Mishra answered |
Polished glass of red colour reflects some of the light incident on it so images of the both persons are formed on it.
Which of the following is a luminous object?- a)Moon
- b)Wooden box
- c)Tube light
- d)Ceramic plate
Correct answer is option 'C'. Can you explain this answer?
a)
Moon
b)
Wooden box
c)
Tube light
d)
Ceramic plate
|
Shiksha Academy answered |
A luminous object emits its own light. A tube light is a source of light, whereas the Moon, wooden box, and ceramic plate do not emit light on their own.
What type of object allows all light to pass through it?- a)Opaque
- b)Translucent
- c)Transparent
- d)Reflective
Correct answer is option 'C'. Can you explain this answer?
a)
Opaque
b)
Translucent
c)
Transparent
d)
Reflective
|
|
Dr Manju Sen answered |
Transparent objects allow all light to pass through them, enabling clear visibility of objects on the other side.
When Abhishek looked at a lighted torch through an object he could see a faint glow, but not the torch. The object is- a)Transparent
- b)Opaque
- c)Translucent
- d)None of these
Correct answer is option 'C'. Can you explain this answer?
When Abhishek looked at a lighted torch through an object he could see a faint glow, but not the torch. The object is
a)
Transparent
b)
Opaque
c)
Translucent
d)
None of these
|
Subham Verma answered |
Translucent objects allow only a small part of light to pass through them.
What happens to light when it strikes a plane mirror?- a)It refracts
- b)It absorbs
- c)It reflects
- d)It diffuses
Correct answer is option 'C'. Can you explain this answer?
a)
It refracts
b)
It absorbs
c)
It reflects
d)
It diffuses
|
|
Rounak Patel answered |
What Happens to Light on Striking a Plane Mirror?
When light strikes a plane mirror, the primary phenomenon observed is reflection. Here’s a detailed explanation of this process:
Reflection of Light
- Definition: Reflection occurs when light rays bounce back from a surface.
- Plane Mirror Characteristics: A plane mirror has a flat, smooth surface that reflects light uniformly.
Law of Reflection
- Incident Ray: The incoming light ray that strikes the mirror is called the incident ray.
- Reflected Ray: The light ray that bounces back is known as the reflected ray.
- Normal Line: An imaginary line perpendicular to the surface at the point of incidence.
- Angle of Incidence: The angle between the incident ray and the normal line.
- Angle of Reflection: The angle between the reflected ray and the normal line.
- Key Principle: The angle of incidence is always equal to the angle of reflection.
Why Reflection Occurs?
- Smooth Surface: The smooth surface of a plane mirror allows for a clear reflection, as all incident rays reflect at the same angle.
- Visual Clarity: This property makes mirrors effective for producing clear images, as they redirect light without scattering.
Conclusion
In summary, when light strikes a plane mirror, it reflects back, allowing us to see clear images. The correct answer to the question is option 'C', as reflection is the primary interaction of light with a plane mirror. This fundamental concept is crucial in understanding how mirrors work and is foundational in the study of optics.
When light strikes a plane mirror, the primary phenomenon observed is reflection. Here’s a detailed explanation of this process:
Reflection of Light
- Definition: Reflection occurs when light rays bounce back from a surface.
- Plane Mirror Characteristics: A plane mirror has a flat, smooth surface that reflects light uniformly.
Law of Reflection
- Incident Ray: The incoming light ray that strikes the mirror is called the incident ray.
- Reflected Ray: The light ray that bounces back is known as the reflected ray.
- Normal Line: An imaginary line perpendicular to the surface at the point of incidence.
- Angle of Incidence: The angle between the incident ray and the normal line.
- Angle of Reflection: The angle between the reflected ray and the normal line.
- Key Principle: The angle of incidence is always equal to the angle of reflection.
Why Reflection Occurs?
- Smooth Surface: The smooth surface of a plane mirror allows for a clear reflection, as all incident rays reflect at the same angle.
- Visual Clarity: This property makes mirrors effective for producing clear images, as they redirect light without scattering.
Conclusion
In summary, when light strikes a plane mirror, it reflects back, allowing us to see clear images. The correct answer to the question is option 'C', as reflection is the primary interaction of light with a plane mirror. This fundamental concept is crucial in understanding how mirrors work and is foundational in the study of optics.
Which material is an example of a translucent object?- a)Clear plastic sheet
- b)Frosted glass
- c)Aluminum foil
- d)Mirror
Correct answer is option 'B'. Can you explain this answer?
a)
Clear plastic sheet
b)
Frosted glass
c)
Aluminum foil
d)
Mirror
|
|
Coachify answered |
Translucent objects allow some light to pass through but scatter it, making frosted glass a good example.
Which of the following is NOT necessary for the formation of a shadow?- a)Light source
- b)Opaque object
- c)Transparent screen
- d)Surface to cast the shadow
Correct answer is option 'C'. Can you explain this answer?
a)
Light source
b)
Opaque object
c)
Transparent screen
d)
Surface to cast the shadow
|
|
Vp Classes answered |
A transparent screen is not required for a shadow, but a light source, an opaque object, and a surface are essential.
Vijay puts some water into four cups made of steel, porcelain, glass, frosted glass. Which one of these cups will allow him to see the level of the water clearly?- a)Glass cup
- b)Steel cup
- c)Porcelain cup
- d)Frosted glass cup
Correct answer is option 'A'. Can you explain this answer?
Vijay puts some water into four cups made of steel, porcelain, glass, frosted glass. Which one of these cups will allow him to see the level of the water clearly?
a)
Glass cup
b)
Steel cup
c)
Porcelain cup
d)
Frosted glass cup
|
Shilpa Dasgupta answered |
Glass is a transparent material. It allows light to pass through it.
The image formed in water is:- a)Erect
- b)Diminished
- c)Inverted
- d)None of these
Correct answer is option 'A'. Can you explain this answer?
The image formed in water is:
a)
Erect
b)
Diminished
c)
Inverted
d)
None of these
|
Nishtha Mukherjee answered |
Understanding Image Formation in Water
When we discuss how images are formed when looking through water, it’s essential to consider the properties of light and how it behaves when it passes through different mediums.
How Light Interacts with Water
- Light travels at different speeds in different mediums.
- When light enters water from air, it bends (refracts) due to the change in speed.
Characteristics of the Image Formed
- Erect Image: When an object is placed in water, the image formed is upright or erect. This means the orientation of the image matches that of the object.
- Diminished Size: The image may appear smaller than the actual object, but it remains upright.
Why is the Image Erect?
- This happens because of the way light rays converge after passing through the water.
- When observing an object submerged in water, the angle of incidence and the angle of refraction create an effect that keeps the image upright.
Conclusion
In conclusion, when viewing an object submerged in water, the image formed is erect due to the refraction of light. This unique property of light allows us to see objects clearly even when they are partially covered by water.
Thus, the correct answer is indeed option 'A': the image formed in water is erect.
When we discuss how images are formed when looking through water, it’s essential to consider the properties of light and how it behaves when it passes through different mediums.
How Light Interacts with Water
- Light travels at different speeds in different mediums.
- When light enters water from air, it bends (refracts) due to the change in speed.
Characteristics of the Image Formed
- Erect Image: When an object is placed in water, the image formed is upright or erect. This means the orientation of the image matches that of the object.
- Diminished Size: The image may appear smaller than the actual object, but it remains upright.
Why is the Image Erect?
- This happens because of the way light rays converge after passing through the water.
- When observing an object submerged in water, the angle of incidence and the angle of refraction create an effect that keeps the image upright.
Conclusion
In conclusion, when viewing an object submerged in water, the image formed is erect due to the refraction of light. This unique property of light allows us to see objects clearly even when they are partially covered by water.
Thus, the correct answer is indeed option 'A': the image formed in water is erect.
What kinds of objects do not allow light to pass through them?- a)Transparent
- b)Translucent
- c)Opaque
- d)Luminous
Correct answer is option 'C'. Can you explain this answer?
What kinds of objects do not allow light to pass through them?
a)
Transparent
b)
Translucent
c)
Opaque
d)
Luminous
|
Subset Academy answered |
- Opaque objects do not allow any light to pass through them.
- Examples include materials like wood, metal, and stone.
- When light hits an opaque object, it is either absorbed or reflected, preventing any transmission.
- In contrast, transparent objects (like glass) let light through, while translucent objects (like frosted glass) allow some light but scatter it.
- Understanding these differences helps in various applications, from construction to design.
- Examples include materials like wood, metal, and stone.
- When light hits an opaque object, it is either absorbed or reflected, preventing any transmission.
- In contrast, transparent objects (like glass) let light through, while translucent objects (like frosted glass) allow some light but scatter it.
- Understanding these differences helps in various applications, from construction to design.
What is the main difference between a shadow and a reflection?- a)Shadows are colored; reflections are not
- b)Shadows are formed by opaque objects; reflections by smooth surfaces
- c)Shadows require a screen; reflections do not
- d)Shadows are always smaller; reflections are always larger
Correct answer is option 'B'. Can you explain this answer?
a)
Shadows are colored; reflections are not
b)
Shadows are formed by opaque objects; reflections by smooth surfaces
c)
Shadows require a screen; reflections do not
d)
Shadows are always smaller; reflections are always larger
|
|
Shiksha Academy answered |
Shadows occur when an opaque object blocks light, while reflections are formed on smooth surfaces by the bouncing of light.
What type of image is formed by a plane mirror?- a)Real and inverted
- b)Virtual and upright
- c)Real and upright
- d)Virtual and inverted
Correct answer is option 'B'. Can you explain this answer?
a)
Real and inverted
b)
Virtual and upright
c)
Real and upright
d)
Virtual and inverted
|
Kalyan Sengupta answered |
Understanding Image Formation by a Plane Mirror
When light rays hit a plane mirror, they reflect off the surface, creating an image. The characteristics of this image can be understood through the following points:
1. Type of Image
- The image formed by a plane mirror is virtual.
- This means that the image cannot be projected onto a screen; it appears to be behind the mirror.
2. Orientation of the Image
- The image is also upright.
- This means that the image maintains the same orientation as the object, which is particularly noticeable in everyday use, like when looking at oneself in a mirror.
3. Characteristics of Virtual Images
- Virtual images, like those formed by plane mirrors, are formed by the apparent divergence of light rays.
- They are always located at the same distance behind the mirror as the object is in front of it.
4. Comparison with Other Image Types
- Real images are formed by the convergence of light rays and can be projected onto a screen. They are typically inverted.
- In contrast, images produced by plane mirrors differ significantly from real images, as they are neither converged nor inverted.
Conclusion
Thus, the correct answer to the question is option B: Virtual and upright. This is a fundamental concept in optics, making plane mirrors fascinating in their simplicity and utility in daily life.
When light rays hit a plane mirror, they reflect off the surface, creating an image. The characteristics of this image can be understood through the following points:
1. Type of Image
- The image formed by a plane mirror is virtual.
- This means that the image cannot be projected onto a screen; it appears to be behind the mirror.
2. Orientation of the Image
- The image is also upright.
- This means that the image maintains the same orientation as the object, which is particularly noticeable in everyday use, like when looking at oneself in a mirror.
3. Characteristics of Virtual Images
- Virtual images, like those formed by plane mirrors, are formed by the apparent divergence of light rays.
- They are always located at the same distance behind the mirror as the object is in front of it.
4. Comparison with Other Image Types
- Real images are formed by the convergence of light rays and can be projected onto a screen. They are typically inverted.
- In contrast, images produced by plane mirrors differ significantly from real images, as they are neither converged nor inverted.
Conclusion
Thus, the correct answer to the question is option B: Virtual and upright. This is a fundamental concept in optics, making plane mirrors fascinating in their simplicity and utility in daily life.
Which of the following explains why air is not visible?- a)It is nearly a perfect transparent substance.
- b)It neither absorbs nor reflects light.
- c)It transmits whole of light.
- d)All of these.
Correct answer is option 'B'. Can you explain this answer?
Which of the following explains why air is not visible?
a)
It is nearly a perfect transparent substance.
b)
It neither absorbs nor reflects light.
c)
It transmits whole of light.
d)
All of these.
|
Tanishq Dasgupta answered |
An object is visible, when it either absorbs light or reflects light. Air is not visible because it neither absorbs nor reflects light.
Which of the following statements is not true?- a)A cylindrical object can cast a rectangular as well as a circular shadow.
- b)Polished surface produces a clear image.
- c)The umbra is the region of a shadow which is grey in colour.
- d)Light travels in a straight line.
Correct answer is option 'C'. Can you explain this answer?
Which of the following statements is not true?
a)
A cylindrical object can cast a rectangular as well as a circular shadow.
b)
Polished surface produces a clear image.
c)
The umbra is the region of a shadow which is grey in colour.
d)
Light travels in a straight line.
|
|
Rounak Chawla answered |
Understanding Shadows and Light
In the context of shadows and light, let’s clarify why option 'C' is not true.
What is the Umbra?
- The umbra refers to the darkest part of a shadow where the light source is completely blocked.
- Contrary to option 'C', the umbra is not grey; it appears black or very dark because it lacks direct light.
Characteristics of Shadows
- Shadows are formed when an opaque object obstructs light.
- The nature of the shadow can vary based on the shape of the object and the angle of the light source.
Analysis of Other Options
- Option A: A cylindrical object can cast shadows of different shapes depending on the light source’s angle. This statement is true.
- Option B: A polished surface reflects light more effectively, producing clearer images. This statement is also true.
- Option D: Light does indeed travel in straight lines unless it interacts with different media (like bending in water). This statement is true as well.
Conclusion
- Therefore, while options A, B, and D are accurate, option C is misleading as the umbra is characterized by a lack of light, resulting in a dark shadow instead of grey. Understanding these fundamentals helps in grasping how shadows are formed and perceived.
In the context of shadows and light, let’s clarify why option 'C' is not true.
What is the Umbra?
- The umbra refers to the darkest part of a shadow where the light source is completely blocked.
- Contrary to option 'C', the umbra is not grey; it appears black or very dark because it lacks direct light.
Characteristics of Shadows
- Shadows are formed when an opaque object obstructs light.
- The nature of the shadow can vary based on the shape of the object and the angle of the light source.
Analysis of Other Options
- Option A: A cylindrical object can cast shadows of different shapes depending on the light source’s angle. This statement is true.
- Option B: A polished surface reflects light more effectively, producing clearer images. This statement is also true.
- Option D: Light does indeed travel in straight lines unless it interacts with different media (like bending in water). This statement is true as well.
Conclusion
- Therefore, while options A, B, and D are accurate, option C is misleading as the umbra is characterized by a lack of light, resulting in a dark shadow instead of grey. Understanding these fundamentals helps in grasping how shadows are formed and perceived.
You are standing upright in a room in front of a vertical mirror. In this mirror, you can see from your position, only the upper two- third part of your body. You wish to see the full image of your body in the mirror. Which combination of the following three courses of action will achieve this?
I. Move away from the mirror
II. Move towards the mirror
III. Use a mirror whose height will allow you to see your full image - a)I only
- b)II only
- c)Either I or III
- d)III only
Correct answer is option 'C'. Can you explain this answer?
You are standing upright in a room in front of a vertical mirror. In this mirror, you can see from your position, only the upper two- third part of your body. You wish to see the full image of your body in the mirror. Which combination of the following three courses of action will achieve this?
I. Move away from the mirror
II. Move towards the mirror
III. Use a mirror whose height will allow you to see your full image
I. Move away from the mirror
II. Move towards the mirror
III. Use a mirror whose height will allow you to see your full image
a)
I only
b)
II only
c)
Either I or III
d)
III only
|
Harshad Datta answered |
Understanding the Mirror Reflection
When trying to view your entire body in a mirror, your position relative to the mirror and the mirror's size are crucial factors. Here's how each option helps achieve this goal:
Option I: Move away from the mirror
- By moving away from the mirror, you increase the distance from which you can see your reflection.
- This allows a larger area of your body to be reflected, as the angle of view expands.
Option II: Move towards the mirror
- Moving closer to the mirror limits the area you can see.
- This option would not help you view your full body; instead, it would likely reduce the visible area.
Option III: Use a mirror whose height will allow you to see your full image
- A taller mirror can reflect a larger portion of your body regardless of your distance from it.
- This is a practical solution to ensure you can see your full image.
Conclusion: Why Option C is Correct
- Since moving away (Option I) allows for greater reflection visibility, and using a taller mirror (Option III) ensures you can see your entire body, either option will suffice.
- Option II, however, is not helpful as it restricts your view.
Thus, the correct combination to achieve your goal is either moving away from the mirror or using a taller mirror, making option 'C' the best choice.
When trying to view your entire body in a mirror, your position relative to the mirror and the mirror's size are crucial factors. Here's how each option helps achieve this goal:
Option I: Move away from the mirror
- By moving away from the mirror, you increase the distance from which you can see your reflection.
- This allows a larger area of your body to be reflected, as the angle of view expands.
Option II: Move towards the mirror
- Moving closer to the mirror limits the area you can see.
- This option would not help you view your full body; instead, it would likely reduce the visible area.
Option III: Use a mirror whose height will allow you to see your full image
- A taller mirror can reflect a larger portion of your body regardless of your distance from it.
- This is a practical solution to ensure you can see your full image.
Conclusion: Why Option C is Correct
- Since moving away (Option I) allows for greater reflection visibility, and using a taller mirror (Option III) ensures you can see your entire body, either option will suffice.
- Option II, however, is not helpful as it restricts your view.
Thus, the correct combination to achieve your goal is either moving away from the mirror or using a taller mirror, making option 'C' the best choice.
What property of light explains the formation of shadows?- a)Light travels in a straight line
- b)Light bends around objects
- c)Light scatters in all directions
- d)Light changes speed in different media
Correct answer is option 'A'. Can you explain this answer?
a)
Light travels in a straight line
b)
Light bends around objects
c)
Light scatters in all directions
d)
Light changes speed in different media
|
|
Dr Manju Sen answered |
Shadows are formed because light travels in straight lines and cannot bend around opaque objects.
In a pinhole camera, how does the image appear?- a)Upright and magnified
- b)Inverted and smaller
- c)Upright and smaller
- d)Inverted and same size
Correct answer is option 'B'. Can you explain this answer?
a)
Upright and magnified
b)
Inverted and smaller
c)
Upright and smaller
d)
Inverted and same size
|
|
Shiksha Academy answered |
The pinhole camera forms an inverted and smaller image due to the straight-line propagation of light through the small hole.
Which of the following is an example of an opaque object?- a)Clear glass
- b)Butter paper
- c)Wooden screen
- d)Soap bubble
Correct answer is option 'C'. Can you explain this answer?
a)
Clear glass
b)
Butter paper
c)
Wooden screen
d)
Soap bubble
|
|
Coachify answered |
Opaque objects do not allow light to pass through them, making a wooden screen an example of an opaque object.
Which phenomenon explains why we can see our reflection in a mirror?- a)Refraction
- b)Diffusion
- c)Reflection
- d)Absorption
Correct answer is option 'C'. Can you explain this answer?
a)
Refraction
b)
Diffusion
c)
Reflection
d)
Absorption
|
|
Shiksha Academy answered |
The reflection of light on smooth surfaces like mirrors enables us to see our image.
Which of the following materials would cast the darkest shadow?- a)Clear plastic
- b)Wax paper
- c)Cardboard
- d)Thin cloth
Correct answer is option 'C'. Can you explain this answer?
a)
Clear plastic
b)
Wax paper
c)
Cardboard
d)
Thin cloth
|
|
Praveen Kumar answered |
Cardboard is completely opaque and blocks all light, casting the darkest shadow.
There is no dark shadow formed by the glass when light is shone on it. This is because 
- a)It is not night time yet.
- b)The light is not strong enough.
- c)The glass is a transparent object.
- d)The distance between glass and screen is very large.
Correct answer is option 'C'. Can you explain this answer?
There is no dark shadow formed by the glass when light is shone on it. This is because
a)
It is not night time yet.
b)
The light is not strong enough.
c)
The glass is a transparent object.
d)
The distance between glass and screen is very large.
|
Vaibhav Shah answered |
The shadows are formed when the opaque object cuts off the light from the source. Since glass is transparent, it allows the light to pass through it. So no dark shadow is formed.
Which of the following allows light to pass through it easily?- a)A metal plate
- b)A glass tumbler
- c)A book
- d)A wooden block
Correct answer is option 'B'. Can you explain this answer?
Which of the following allows light to pass through it easily?
a)
A metal plate
b)
A glass tumbler
c)
A book
d)
A wooden block
|
Kiran Reddy answered |
A glass tumbler is a transparent substance which allows light to pass through it easily.
Chapter doubts & questions for Light, Shadow and Reflections - Class 6 All Subjects (Old NCERT) 2025 is part of Class 6 exam preparation. The chapters have been prepared according to the Class 6 exam syllabus. The Chapter doubts & questions, notes, tests & MCQs are made for Class 6 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests here.
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