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1. The human eye forms an image of an object at its

2. The human eye is approximately ______ in diameter.

3. Which part of the human eye controls the amount of light entering it?

4. The least distance of distinct vision for a young adult with normal vision is about

5. The ability of the eye lens to adjust its focal length is called

7. Myopia is also known as

8. In a myopic eye, the image of a distant object is formed

9. Which type of lens is used to correct myopia?

10. Hypermetropia is also known as

11. The defect of vision where the near point is farther than normal is

12. Which lens is used to correct hypermetropia?

13. Presbyopia is caused due to

14. A person suffering from both myopia and hypermetropia needs

15. Cataract in the human eye can be treated by

16. The splitting of white light into seven colours is called

17. The band of coloured components of light is called

18. In dispersion of light, the colour that bends the least is

19. The colour that bends the most in dispersion is

20. Newton proved that white light is composed of