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All questions of Light for Class 7 Exam
Concave lens is also known as- a)Converging lens
- b)Diverging lens
- c)Bifocal length
- d)Biconcave lens
Correct answer is option 'B'. Can you explain this answer?
Concave lens is also known as
a)
Converging lens
b)
Diverging lens
c)
Bifocal length
d)
Biconcave lens
|
Ananya Choudhary answered |
Concave lenses are thinner at the middle. Rays of light that pass through the lens are spread out (they diverge). A concave lens is a diverging lens. When parallel rays of light pass through a concave lens the refracted rays diverge so that they appear to come from one point called the principal focus.
A common magnifying glass is an example of- a)Concave lens
- b)Convex mirror
- c)Concave mirror
- d)Convex lens
Correct answer is option 'D'. Can you explain this answer?
A common magnifying glass is an example of
a)
Concave lens
b)
Convex mirror
c)
Concave mirror
d)
Convex lens
|
Anand Ghoshal answered |
A common magnifying glass is an example of convex lens of short focal length.
The perpendicular to the reflecting surface is called- a)Refracted rays
- b)Reflected rays
- c)Incident rays
- d)Normal
Correct answer is option 'D'. Can you explain this answer?
The perpendicular to the reflecting surface is called
a)
Refracted rays
b)
Reflected rays
c)
Incident rays
d)
Normal
|
Kavya Rane answered |
The ray of light which is sent back by the reflecting surface is called a reflected ray. Normal line: The perpendicular line drawn on to the surface of the mirror at the point of incidence is called normal line.
Which of the following is a reflector of light?- a)Sun
- b)Moon
- c)Star
- d)Filament
Correct answer is option 'B'. Can you explain this answer?
Which of the following is a reflector of light?
a)
Sun
b)
Moon
c)
Star
d)
Filament
|
Sharmila Chakraborty answered |
Moon does not have any light of its own; it reflects the light of the sun.
Shaving mirror are usually- a)Plane
- b)Concave
- c)Convex
- d)Biconcave
Correct answer is option 'B'. Can you explain this answer?
Shaving mirror are usually
a)
Plane
b)
Concave
c)
Convex
d)
Biconcave
|
Akash Patel answered |
Shaving mirrors are usually concave mirror to form virtual, erect and magnified image of face.
Concave mirror is used in head light of vehicles as- a)It reflects the parallel beam of lightt
- b)It is easy to use
- c)It can be easily cleaned
- d)It forms the strong beam of light
Correct answer is option 'A'. Can you explain this answer?
Concave mirror is used in head light of vehicles as
a)
It reflects the parallel beam of lightt
b)
It is easy to use
c)
It can be easily cleaned
d)
It forms the strong beam of light
|
Jatin Chatterjee answered |
Concave mirror is used in headlight of vehicle as it reflects a parallel beam of light.when the head light is placed at focus of concave mirror it allow the light to spread out to infinity.
How is a rainbow formed?- a)Reflection of sunlight
- b)Refraction and reflection of the sun's rays through raindrops
- c)Dispersion of sunlight
- d)Diffraction of sunlight
Correct answer is option 'B'. Can you explain this answer?
How is a rainbow formed?
a)
Reflection of sunlight
b)
Refraction and reflection of the sun's rays through raindrops
c)
Dispersion of sunlight
d)
Diffraction of sunlight
|
Praveen Kumar answered |
A rainbow is formed by the refraction and reflection of the sun's rays through raindrops.
What is a convex mirror used for in security measures in supermarkets, stores, and ATM centers?- a)To create real images
- b)To make objects appear larger
- c)To provide a wider field of view
- d)To invert the orientation of objects
Correct answer is option 'C'. Can you explain this answer?
What is a convex mirror used for in security measures in supermarkets, stores, and ATM centers?
a)
To create real images
b)
To make objects appear larger
c)
To provide a wider field of view
d)
To invert the orientation of objects
|
Coachify answered |
Convex mirrors are used for security to have a broader view, as they produce virtual, erect, and diminished images.
What do you notice when you see your image in a mirror?
- a)Your image is different from you
- b)Your image is exactly like you
- c)Your image is smaller than you
- d)Your image is bigger than you
Correct answer is option 'B'. Can you explain this answer?
What do you notice when you see your image in a mirror?
a)
Your image is different from you
b)
Your image is exactly like you
c)
Your image is smaller than you
d)
Your image is bigger than you
|
Sarah Michelle Simon answered |
Our image in the mirror is horrizantly inverted (flipped). When we raise our right hand, in the mirror, it appears as if we have raised our left hand. When we look at text in the mirror, it is unreadable. This is because even the text is horizontaly inverted. So, our image in the mirror is different from us.
What is the characteristic feature of the image formed by a convex lens when the object is placed close to it?- a)Real, inverted, and magnified
- b)Upright, virtual, and magnified
- c)Virtual, erect, and smaller
- d)Real, inverted, and diminished
Correct answer is option 'B'. Can you explain this answer?
What is the characteristic feature of the image formed by a convex lens when the object is placed close to it?
a)
Real, inverted, and magnified
b)
Upright, virtual, and magnified
c)
Virtual, erect, and smaller
d)
Real, inverted, and diminished
|
Mythili desai answered |
Characteristics of the Image Formed by a Convex Lens
When an object is placed close to a convex lens, the image formed has the following characteristics:
Upright:
- The image formed by a convex lens when the object is placed close to it is upright. This means that the orientation of the image is the same as the orientation of the object.
Virtual:
- The image formed is virtual, which means that the light rays do not actually converge at the location of the image. Instead, they appear to diverge from a point behind the lens.
Magnified:
- The image formed by a convex lens when the object is placed close to it is magnified. This means that the size of the image is larger than the size of the object.
Therefore, the correct characteristic feature of the image formed by a convex lens when the object is placed close to it is upright, virtual, and magnified.
When an object is placed close to a convex lens, the image formed has the following characteristics:
Upright:
- The image formed by a convex lens when the object is placed close to it is upright. This means that the orientation of the image is the same as the orientation of the object.
Virtual:
- The image formed is virtual, which means that the light rays do not actually converge at the location of the image. Instead, they appear to diverge from a point behind the lens.
Magnified:
- The image formed by a convex lens when the object is placed close to it is magnified. This means that the size of the image is larger than the size of the object.
Therefore, the correct characteristic feature of the image formed by a convex lens when the object is placed close to it is upright, virtual, and magnified.
A concave mirror forms a _____ image of the sun.- a)Real
- b)Virtual
- c)Dark
- d)Erect
Correct answer is option 'A'. Can you explain this answer?
A concave mirror forms a _____ image of the sun.
a)
Real
b)
Virtual
c)
Dark
d)
Erect
|
Gunjan Lakhani answered |
When a concave mirror is held facing the Sun, it forms a real image of the Sun. A real image is like a picture that you can see on a screen.
What happens when light falls on a shiny surface?- a)It gets absorbed
- b)It changes direction
- c)It disappears
- d)It gets brighter
Correct answer is option 'B'. Can you explain this answer?
What happens when light falls on a shiny surface?
a)
It gets absorbed
b)
It changes direction
c)
It disappears
d)
It gets brighter
|
Rainbow Rise Classes answered |
- When light falls on a shiny surface, it doesn't get absorbed or disappear.
- Instead, it changes direction. Imagine light as a bouncy ball hitting a shiny wall – it bounces off in another direction.
- This bouncing of light off shiny surfaces helps us see reflections and images around us. So, when light meets something shiny, it doesn't go through or vanish; it reflects and changes its path!
Concave mirrors are used by doctors to examine __________.
- a)Eyes
- b)All of these
- c)Ears
- d)Throat
Correct answer is option 'B'. Can you explain this answer?
Concave mirrors are used by doctors to examine __________.
a)
Eyes
b)
All of these
c)
Ears
d)
Throat
|
Rohini Seth answered |
Doctors use concave mirrors to look at your eyes. They help doctors see things more clearly to check if your eyes are healthy. So, concave mirrors are helpful for doctors to see inside your eyes better.
State whether the following statement is True or FalseIn a plane mirror, the image formed is smaller than the object.- a)True
- b)False
Correct answer is option 'B'. Can you explain this answer?
State whether the following statement is True or False
In a plane mirror, the image formed is smaller than the object.
a)
True
b)
False
|
Atharva Chawla answered |
Explanation:
Plane Mirror:
- A plane mirror is a flat, smooth surface that reflects light without distortion.
- When an object is placed in front of a plane mirror, it forms a virtual image behind the mirror.
Image Formation in a Plane Mirror:
- The image formed in a plane mirror is virtual and upright.
- The size of the image is the same as the size of the object.
- The image formed in a plane mirror is a laterally inverted image, meaning left appears as right and right appears as left in the image.
Size of the Image:
- The statement that the image formed in a plane mirror is smaller than the object is false.
- In a plane mirror, the size of the image is the same as the size of the object.
- The distance between the object and the mirror is equal to the distance between the mirror and the image.
Therefore, the correct answer is False. The image formed in a plane mirror is not smaller than the object; it is the same size as the object.
Plane Mirror:
- A plane mirror is a flat, smooth surface that reflects light without distortion.
- When an object is placed in front of a plane mirror, it forms a virtual image behind the mirror.
Image Formation in a Plane Mirror:
- The image formed in a plane mirror is virtual and upright.
- The size of the image is the same as the size of the object.
- The image formed in a plane mirror is a laterally inverted image, meaning left appears as right and right appears as left in the image.
Size of the Image:
- The statement that the image formed in a plane mirror is smaller than the object is false.
- In a plane mirror, the size of the image is the same as the size of the object.
- The distance between the object and the mirror is equal to the distance between the mirror and the image.
Therefore, the correct answer is False. The image formed in a plane mirror is not smaller than the object; it is the same size as the object.
We can see an object when it- a)Refract or absorb the rays of light
- b)Reflect or emit rays of light
- c)Has bright colour
- d)Has shining surface
Correct answer is option 'B'. Can you explain this answer?
We can see an object when it
a)
Refract or absorb the rays of light
b)
Reflect or emit rays of light
c)
Has bright colour
d)
Has shining surface
|
Pooja Banerjee answered |
We are able to see because light from an object can move through space and reach our eyes. Once light reaches our eyes, signals are sent to our brain, and our brain deciphers the information in order to detect the appearance, location and movement of the objects we are sighting at.
What does the term "dispersion of light through a prism" refer to?- a)Bending of light
- b)Reflection of light
- c)Separation of colors in white light
- d)Absorption of light
Correct answer is option 'C'. Can you explain this answer?
What does the term "dispersion of light through a prism" refer to?
a)
Bending of light
b)
Reflection of light
c)
Separation of colors in white light
d)
Absorption of light
|
|
Rainbow Rise Classes answered |
Dispersion through a prism involves the separation of different colors in white light as they bend differently.
In a mirror maze, why do people see several images of themselves?- a)Due to refraction
- b)Due to dispersion
- c)Based on the principle of reflection in plane mirrors
- d)Because of diffraction
Correct answer is option 'C'. Can you explain this answer?
In a mirror maze, why do people see several images of themselves?
a)
Due to refraction
b)
Due to dispersion
c)
Based on the principle of reflection in plane mirrors
d)
Because of diffraction
|
|
Gunjan Lakhani answered |
Mirror mazes utilize the principle of reflection in plane mirrors, creating multiple images of the observer.
If initially David is 4 meters far from the mirror, he moves 1 meter towards a plane mirror, the distance between David and his image will be:- a)3 meters
- b)5 meters
- c)6 meters
- d)8 meters
Correct answer is option 'C'. Can you explain this answer?
a)
3 meters
b)
5 meters
c)
6 meters
d)
8 meters
|
|
Raj Chakraborty answered |
Understanding the Scenario
David starts 4 meters away from a plane mirror. When he moves 1 meter towards the mirror, we need to determine the distance between David and his image.
Initial Position
- David's initial distance from the mirror: **4 meters**
- When David looks into the mirror, his image appears **4 meters behind the mirror**. Thus, the total distance from David to his image initially is:
- **Total distance = Distance to mirror + Distance behind mirror**
- **Total distance = 4 meters + 4 meters = 8 meters**
Movement Towards the Mirror
- David moves **1 meter closer** to the mirror:
- New distance from the mirror: **4 meters - 1 meter = 3 meters**
Calculating the New Distance to His Image
- With David now **3 meters** away from the mirror, the image is still **3 meters behind the mirror**.
- Therefore, the new total distance between David and his image is:
- **Total distance = Distance to mirror + Distance behind mirror**
- **Total distance = 3 meters + 3 meters = 6 meters**
Correct Answer
- Thus, the distance between David and his image after he moves 1 meter towards the mirror is **6 meters**.
The correct answer is option **'C' (6 meters)**.
David starts 4 meters away from a plane mirror. When he moves 1 meter towards the mirror, we need to determine the distance between David and his image.
Initial Position
- David's initial distance from the mirror: **4 meters**
- When David looks into the mirror, his image appears **4 meters behind the mirror**. Thus, the total distance from David to his image initially is:
- **Total distance = Distance to mirror + Distance behind mirror**
- **Total distance = 4 meters + 4 meters = 8 meters**
Movement Towards the Mirror
- David moves **1 meter closer** to the mirror:
- New distance from the mirror: **4 meters - 1 meter = 3 meters**
Calculating the New Distance to His Image
- With David now **3 meters** away from the mirror, the image is still **3 meters behind the mirror**.
- Therefore, the new total distance between David and his image is:
- **Total distance = Distance to mirror + Distance behind mirror**
- **Total distance = 3 meters + 3 meters = 6 meters**
Correct Answer
- Thus, the distance between David and his image after he moves 1 meter towards the mirror is **6 meters**.
The correct answer is option **'C' (6 meters)**.
What are the characteristics of an image formed by a plane mirror?
- a)Inverted and real
- b)Upright and virtual
- c)Magnified and real
- d)Magnified and virtual
Correct answer is option 'B'. Can you explain this answer?
What are the characteristics of an image formed by a plane mirror?
a)
Inverted and real
b)
Upright and virtual
c)
Magnified and real
d)
Magnified and virtual
|
|
Gunjan Lakhani answered |
Images formed by a plane mirror are upright, virtual, and the same size as the object.
What type of image is formed by a concave lens?- a)Real and inverted
- b)Virtual and erect
- c)Real and erect
- d)Virtual and inverted
Correct answer is option 'B'. Can you explain this answer?
a)
Real and inverted
b)
Virtual and erect
c)
Real and erect
d)
Virtual and inverted
|
Shambavi rao answered |
Understanding Image Formation by Concave Lenses
Concave lenses are unique optical devices that play a crucial role in image formation. Their characteristics lead to specific types of images, which can be explained as follows:
Characteristics of Concave Lenses
- Diverging Lens: Concave lenses are known as diverging lenses because they spread out light rays that pass through them.
- Focal Point: They have a virtual focal point, which is located on the same side as the object being viewed.
Type of Image Formed
- Virtual Image: When an object is placed in front of a concave lens, the light rays diverge after passing through the lens. These rays appear to come from a point behind the lens, which is why the image formed is virtual.
- Erect Image: The virtual image created by a concave lens is also erect, meaning it has the same orientation as the object.
Summarizing the Key Points
- Real and Inverted: This is not applicable for concave lenses, as they do not form real images.
- Virtual and Erect: This is the correct answer. The image is virtual and appears upright.
- Real and Erect: Concave lenses do not produce real images, thus this option is incorrect.
- Virtual and Inverted: Again, this is incorrect since the virtual image produced by a concave lens is always erect.
Conclusion
In conclusion, when light passes through a concave lens, it creates a virtual and erect image. This property makes concave lenses useful in various applications, such as in glasses for correcting nearsightedness. Understanding these characteristics helps in grasping the fundamentals of optics.
Concave lenses are unique optical devices that play a crucial role in image formation. Their characteristics lead to specific types of images, which can be explained as follows:
Characteristics of Concave Lenses
- Diverging Lens: Concave lenses are known as diverging lenses because they spread out light rays that pass through them.
- Focal Point: They have a virtual focal point, which is located on the same side as the object being viewed.
Type of Image Formed
- Virtual Image: When an object is placed in front of a concave lens, the light rays diverge after passing through the lens. These rays appear to come from a point behind the lens, which is why the image formed is virtual.
- Erect Image: The virtual image created by a concave lens is also erect, meaning it has the same orientation as the object.
Summarizing the Key Points
- Real and Inverted: This is not applicable for concave lenses, as they do not form real images.
- Virtual and Erect: This is the correct answer. The image is virtual and appears upright.
- Real and Erect: Concave lenses do not produce real images, thus this option is incorrect.
- Virtual and Inverted: Again, this is incorrect since the virtual image produced by a concave lens is always erect.
Conclusion
In conclusion, when light passes through a concave lens, it creates a virtual and erect image. This property makes concave lenses useful in various applications, such as in glasses for correcting nearsightedness. Understanding these characteristics helps in grasping the fundamentals of optics.
What type of lens is used to correct short-sightedness?- a)Convex lens
- b)Diverging lens
- c)Concave lens
- d)Magnifying lens
Correct answer is option 'C'. Can you explain this answer?
What type of lens is used to correct short-sightedness?
a)
Convex lens
b)
Diverging lens
c)
Concave lens
d)
Magnifying lens
|
|
Coachify answered |
Concave lenses are used to correct short-sightedness as they diverge light.
The image in a plane mirror is _____.- a)larger
- b)smaller
- c)inverted
- d)erect
Correct answer is option 'D'. Can you explain this answer?
The image in a plane mirror is _____.
a)
larger
b)
smaller
c)
inverted
d)
erect
|
|
Aurora Institute answered |
The image in a plane mirror is erect, which means it is the same way up as the object you see in the mirror.
What happens to your image in a mirror when you raise your left hand?- a)It raises its left hand
- b)It raises its right hand
- c)It raises both hands
- d)It does not raise any hand
Correct answer is option 'B'. Can you explain this answer?
What happens to your image in a mirror when you raise your left hand?
a)
It raises its left hand
b)
It raises its right hand
c)
It raises both hands
d)
It does not raise any hand
|
|
Aurora Institute answered |
- When you raise your left hand in front of a mirror, your image raises its right hand.
- It's like a magical world where left becomes right and right becomes left in the mirror!
- So, next time you see your mirror image, remember that it's like your twin in a funhouse, playing a mirror game with you.
A convex lens converges light and is also known as a ____ lens.- a)Diverging
- b)Magnifying
- c)Converging
- d)Reflecting
Correct answer is option 'C'. Can you explain this answer?
A convex lens converges light and is also known as a ____ lens.
a)
Diverging
b)
Magnifying
c)
Converging
d)
Reflecting
|
|
Rainbow Rise Classes answered |
A convex lens is a type of lens that bends light inwards, bringing it together at a focal point. This lens is called a converging lens because it makes light rays converge or come together at a point. When light passes through a convex lens, it focuses the light to create an image.
Which of the following statements is true about a convex mirror?- a)It always forms real, inverted, and diminished images.
- b)It can form both real and virtual images depending on the object position.
- c)It always forms virtual, upright, and diminished images.
- d)It forms magnified, real images.
Correct answer is option 'C'. Can you explain this answer?
Which of the following statements is true about a convex mirror?
a)
It always forms real, inverted, and diminished images.
b)
It can form both real and virtual images depending on the object position.
c)
It always forms virtual, upright, and diminished images.
d)
It forms magnified, real images.
|
|
Coachify answered |
A convex mirror always forms virtual, upright, and diminished images, no matter where the object is placed. The image is formed behind the mirror and is smaller than the object.
State whether the following statement is True or FalseLight travels along a curved line.- a)True
- b)False
Correct answer is option 'B'. Can you explain this answer?
State whether the following statement is True or False
Light travels along a curved line.
a)
True
b)
False
|
Bespoke Classes answered |
False. Light travels along a straight line, not a curved line. When light moves, it goes in a straight path, like when you draw a line with a ruler. Imagine light as a tiny arrow that always moves in a straight line until it hits something.
Chapter doubts & questions for Light - Science Class 7 2025 is part of Class 7 exam preparation. The chapters have been prepared according to the Class 7 exam syllabus. The Chapter doubts & questions, notes, tests & MCQs are made for Class 7 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests here.
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