Human Eye And colorful World class 1oth imp questions

 "Om Sai Ram"

Topic :-Human Eye And colorful World

1. What is the least distance of distinct vision of a normal human eye ?

2. Name the muscle responsible for bringing change in the focal length of the eye lens ?

3. Name one defect of vision which cannot be corrected by any type of spectacle lenses ?

4. State one effect produced by the scattering of light by the atmosphere ?

5. What is the nature of image formed on the retina of the eye ?

6. What type of lens is used for correcting hypermetropia ?

7. Who was the first person to obtain the spectrum of sunlight ?

8. What is the function of optic nerve in human eye ?

9. What is range of vision ?

10. Why do different colours deviate through different angles on passing through a prism?

11. As light rays pass from air into glass prism, are they refracted towards or away from the normal ?

12. Which color has largest wavelength ?

13. Which defect of vision can be rectified using a concave lens ?

14. What phenomenon causes twinkling of star on a clear night ?

15. What is meant by scattering of light ?

16. Why does the sky appear black instead of blue to an astronaut?

17. What is the basic cause of atmospheric refraction?

18. Why does clear sky look blue?

19. Can visible light be scattered by atoms/molecules in earth’s atmosphere?

20. What is a spectrum?

21. Name the defect of vision in person

a. Whose near point is more than 25cm away?.

b. Whose far point is less than infinity.

22. Draw a neat labelled diagram showing the refraction of light through a glass prism.

23. The sun is seen a few minutes before actual sunrise and after actual sun set. Explain why?

24. The sky appears black when viewed from the surface of moon. Explain why?

25. Why danger signals are of Red colour?

26. Why sun appears reddish during sunrise and sunset?

27. The setting sun is more reddish than rising sun. Explain why?

28. What is persistence of vision? How does it help us in seeing motion pictures?

29. What are primary colors?

30. Why planets do not twinkle?

31. What is total internal reflection?

32. What is cataract? How is it corrected?

33. Define far point. What is its value for a normal human eye?

34. What is dispersion?

35. Draw a neat diagram to show the dispersion of light when passed through a glass prism.

36. How is rainbow formed?

37. If you see a rainbow in the morning, in which direction of the sky will you see it?

38. What is scattering?

39. Explain the blue colour of sky?

40. Why clouds are white?

41. A red coloured piece of glass appears white when it is ground. Explain why?

42. What is Tyndal effect?

43. Write the constituent colours of white light in order of increasing wavelength.

44. When you enter a dark room from sunlight, you cannot see things for a while and after sometime you start seeing things. Explain this observation.

45. Why do stars twinkle?
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