1. The amount of light entering the eye is controlled by

2. Name the type of mirror used as a backview mirror.

3. If the angle of incidence of light falling on a plane mirror is 30°, what will be the angle of reflection?

4. Light enters the eye through

5. The splitting of white light into its seven constituent colours is called

6. Myopia can be corrected by using a

7. Light passing through a prism splits into seven colours. This is called

8. An owl can see clearly at night but not day time because it has

9. Beam of light striking the reflecting surface is called

10. What is the angle of incidence of a ray if the reflected ray is at an angle of 90° to the incident ray?

11. Which one of the following statements is correct regarding rods and cones in the human eye?

12. Visually impaired people can read and write using

13. The image formed by a camera and a simple microscope are respectively

14. Rainbow is a natural phenomenon showing

15. A smooth shining surface, which rebounds the light back in same or in different direction, is called

16. Front balged part of the eyeball is called

17. Band of seven colours is called

18. In case of reflection of light, the angle of incidence (i) and the angle of reflection (r) are related as

19. When we stand in front of our dressing table, our left hand seems to be right and right seems to be left. This is called

20. The defect due to which a person is not able to see the distant objects clearly