Match the statements in column A with those in column B. Column A Column B 1. Propagation of light in a straight line. (a) Concave lens 2. A polished curved surface that bends rays of light inward. (b) Convex mirror 3. A lens which always forms virtual images. (c) Rectilinear propagation 4. A mirror which always forms diminished image. (d) Concave mirror 5. The breaking of white light into seven colours. (e) Reflection 6. The bending of light from its path in another medium. (f) Dispersion 7. The bouncing off of the rays of light from a smooth polished surface. (g) Refraction

1 . Rectilinear propagation can be defined as the propagation of light in a straight line. The light changes its direction when it strikes to the mirror. 2 . A concave mirror is also known as converging mirror. It can also be defined as a polished curved surface that bends the light inwards. 3 . The concave lens always forms an erect, virtual and diminished image. It is a diverging lens. 4 . The convex mirror always forms a diminished image. The convex mirror is used in the rearview mirror. 5 . Rainbow is a natural phenomenon in which the sunlight gets split into seven colours after passing through the tiny droplets of water. This phenomenon occurs due to the dispersion of light. 6 . Refraction can be defined as a phenomenon in which the light rays get bend while changing its path from one medium to another medium. The light gets deviated from its path when there is a density change in the medium. 7 . Reflection helps to form the image in the mirror. In reflection, the rays get bounced off by its smooth polished surface. Column A Column B 1 . Propagation of light in a straight line. ( c ) Rectilinear propagation 2 . A polished curved surface that bends rays of light inward. ( d ) Concave mirror 3 . A lens which always forms virtual images. ( e ) Concave lens 4 . A mirror which always forms diminished image. ( b ) Convex mirror 5 . The breaking of white light into seven colours. ( f ) Dispersion 6 . The bending of light from its path in another medium. ( g ) Refraction 7 . The bouncing off of the rays of light from a smooth polished surface. ( e ) Reflection

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Learning Elementary Science for Class 7>Chapter 15 - Light>EXERCISES>Q IV

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A mirror in which the reflecting surface curves inward is called a convex mirror.

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Important Questions on Light

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Learning Elementary Science for Class 7>Chapter 15 - Light>EXERCISES>Q IV

A lens which is thicker in the middle and tapering at the edges is called a convex lens.

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Learning Elementary Science for Class 7>Chapter 15 - Light>EXERCISES>Q IV

The face appears magnified when the back of a polished spoon is held close to it.

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Learning Elementary Science for Class 7>Chapter 15 - Light>EXERCISES>Q IV

Light cannot pass through a bent rubber tube.

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Learning Elementary Science for Class 7>Chapter 15 - Light>EXERCISES>Q IV

White light is composed of seven colours.

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Learning Elementary Science for Class 7>Chapter 15 - Light>EXERCISES>Q IV

Bending of rays of light on passing through a medium is called dispersion.

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Learning Elementary Science for Class 7>Chapter 15 - Light>EXERCISES>Q V

Match the statements in column A with those in column B.

Column A	Column B
1. Propagation of light in a straight line.	(a) Concave lens
2. A polished curved surface that bends rays of light inward.	(b) Convex mirror
3. A lens which always forms virtual images.	(c) Rectilinear propagation
4. A mirror which always forms diminished image.	(d) Concave mirror
5. The breaking of white light into seven colours.	(e) Reflection
6. The bending of light from its path in another medium.	(f) Dispersion
7. The bouncing off of the rays of light from a smooth polished surface.	(g) Refraction