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1. is a form of energy and it travels in a straight line.

2. The is an optical device with a polished surface that reflects the light falling on it.

3. mirrors are used in radio telescopes.

4. The line joining the pole of the mirror and its centre of curvature is called .

5. If the object is placed at infinity , then its image is formed at by a convex mirror.

6. mirrors are used in solar cookers.

7. is used by doctors as endoscopes to view internal organs of the body.

8. Refraction of a light ray is propotional to its wavelength.

9. Real images can be formed on .

10. The number of images formed by a mirror depends on the angle of of the mirrors.