Light Class 7 Worksheet Science Chapter 13

Q.1. True/False
(i) We can obtain an enlarged and erect image by a convex mirror.

False

(ii) A concave lens always form a virtual image.

True

(iii) We can obtain a real, enlarged and inverted image by a concave mirror.

True

(iv) A real image cannot be obtained on a screen.

False

(v) A concave mirror always form a real image.

False

(vi) In the mirror the right appears left and the left appears right.

True

Q.2. Fill in the blanks.
(i) An image that cannot be obtained on a screen is called ____.

virtual image

(ii) Image formed by a convex ____ is always virtual and smaller in size.

mirror

(iii) An image formed by a ____ mirror is always of the same size as that of the object.

plane

(iv) An image which can be obtained on a screen is called a ____ image.

real

(v) An image formed by a concave ____ cannot be obtained on a screen.

lens

(vi) A virtual image larger than the object can be produced by a _____.

concave mirror

Q.3. Give an example of a curved mirror.

The most common example of a curved mirror is a spherical mirror.

Q.4. What is real image?

An image which can be obtained on a screen is called a real image.

Q.5. What is convex mirror?

If the reflecting surface is convex, then it is a convex mirror.

Q.6. What makes things visible to us?

Objects are visible only when light reflected from them reaches our eyes.

Q.7. What kind of image is formed by concave lens?

A concave lens always forms erect, virtual and smaller image than the object.

Q.8. What are the two types of spherical mirror?

The two types of spherical mirror are concave and convex mirrors.

Q.9. Write some uses of lenses.

Lenses are widely used in spectacles, telescopes and microscopes.

Q.10. What happens when light falls on a polished or a shiny surface?

When light falls on a polished or a shiny surface light gets reflected.

Q.11. What is diverging lens?

A concave lens diverges (bends outward) the light and is called a diverging lens.

Q.12. What is reflection of light?

Bouncing back of a light ray after hitting any surface is known as reflection of light.

Q.13. Why we are not able to see the candle flame through a bent pipe?

We are not able to see the candle flame through a bent pipe because light travels along straight lines.

Q.14. What type of image does the outer side of a spoon show?

The outer surface of a spoon acts like a convex mirror. Image formed by a convex mirror is erect, virtual and smaller in size than the object.

Q.15. What is the nature of the image formed by a convex mirror?

Image formed by a convex mirror is erect, virtual and smaller in size than the object.

Q.16. What is concave mirror?

If the reflecting surface of a spherical mirror is concave, it is called a concave mirror.

Q.17. How can we change the path of light?

We can change the path of light by keeping any shiny or polished or reflecting material in front of the light beam.

Q.18. What happens when light falls on a mirror?

A mirror changes the direction of light that falls on it. This change of direction by a mirror is called reflection of light.

Q.19. When does rainbow appear in the sky?

Rainbow appears usually after the rain when the sun is low in the sky. The rainbow is seen as a large arc in the sky with many colours.

Q.20. Why are concave and convex mirrors called spherical mirrors?

Concave and convex mirrors are called spherical mirror because their reflecting surfaces are the parts of hollow sphere of glass.