Match the column: Column A Column B 1. Regular reflection a. The angle formed by the reflected ray and normal 2. Incident ray b. The centre of a mirror 3. Angle of reflection c. Converging lens which converges all the rays at a common point 4. Pole d. A ray of light that falls on the surface of the mirror or the reflecting surface 5. Convex lens e. Reflection by a smooth surface

The correct match is shown below: Column A Column B 1. Regular reflection e. Reflection by a smooth surface 2. Incident ray d. A ray of light that falls on the surface of the mirror or the reflecting surface 3. Angle of reflection a. The angle formed by the reflected ray and normal 4. Pole b. The centre of a mirror 5. Convex lens c. Converging lens which converges all the rays at a common point In regular reflection, a parallel beam of light rays is reflected as a parallel beam. The angle of incidence and the angle of reflection are measured with the normal. Normal is drawn at the point of incidence. Convex lens is a converging lens and concave lens is a diverging lens.

Differentiate between convex mirror and concave mirror.

Convex mirror Concave mirror 1) A convex mirror diverges the light rays 1) A concave mirror converges the light rays 2) The spherical mirror in which the reflection of light takes place at the bulging surface (convex surface) is called convex mirror. 2) The spherical mirror in which the reflection of light takes place at a bent surface (concave surface) is called concave mirror. 3) The focal length is negative in a convex mirror 3) The focal length is positive in a concave mirror 4) The convex mirror produces only virtual images 4) Concave mirror produces both real and virtual images

Distinguish between real image and virtual image.

Real image Virtual image 1) Real image can be obtained on a screen. 1) Virtual images cannot be obtained on a screen. 2) A real image is formed when light rays coming from an object actually meet at a point after reflection from a mirror or refraction through a lens. 2) A virtual image is formed when light rays coming from an object only appear to meet at a point when produced backward after reflection from a mirror or refraction through a lens. 3) Real images are inverted. 3) Virtual images are erect.

E M B I B E

Sciwise - A coursebook of Science>Chapter 20 - Light>EXERCISE>Q 7

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7th CBSE

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A convex lens is used in making magnifying glasses.

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Important Questions on Light

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Sciwise - A coursebook of Science>Chapter 20 - Light>EXERCISE>Q 8

Colours of the rainbow are in fact the colours emitted by the clouds.

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Sciwise - A coursebook of Science>Chapter 20 - Light>EXERCISE>Match the following

Match the column:

Column A	Column B
1. Regular reflection	a. The angle formed by the reflected ray and normal
2. Incident ray	b. The centre of a mirror
3. Angle of reflection	c. Converging lens which converges all the rays at a common point
4. Pole	d. A ray of light that falls on the surface of the mirror or the reflecting surface
5. Convex lens	e. Reflection by a smooth surface