1. Rainbow is based on

2. If focal length of concave lens is 4 cm then find its power of lens.

3. People can’t succeed ta catch the fish inside the pond due to

4. Power of lens

5. The critical angle of ice is

6. Group of light rays are called

7. The value of near point is

8. The unit of magnification is

9. Persistence of vision is

10. Which of the following has minimum wavelength?

11. The focal length of a convex lens will be maximum for

12. The velocity of light is in vacuum or air is

13. Which of the following has maximum wavelength?

14. If the angle between incident ray and reflected ray is 120⁰ then find the value of angle of reflaction.60

15. Colour of light is characteristic of

16. Water is seen on the black pitched road during summer season due to

17. The velocity of light in medium like glass is

18. The unit power of lens

19. The critical angle of glass is

20. Which of the following compound is used in camera to make photo negative?HNO

21. The refraction index of diamond is

22. The path through which light travels is

23. When ray of light enters a glass slab from air

24. To remove myopia or short sightedness _____ should be used .

25. The minimum distance between an object and its real image formed by a thin convex lens of focal length f is

26. The process of bending of light ray is called

27. When object is placed at 2F of convex lens then 2F

28. Compound microscope consists of

29. In light spectrum, the colour with highest frequency is

30. When light rays passes from denser to rarer medium then light rays

31. To remove hypermetropia or long sightedness, which lens is used ?

32. When object is placed at 2F of convex lens then 2F

33. Speed of light is represented by

34. How many lenses are arranged in terrestrial telescope?

35. Time to reach the earth by sun is

36. Light pipe is used in

37. A mirror has one focus but a lens has

38. The critical angle of diamond is

39. In critical angle

40. Twinkling of star is due to

41. Average wavelength of light is

42. Wavelength of violet colour is

43. Ultraviolet ray produces

44. When light strikes on some objects it returns back on same medium is called

45. Dispersion of light is caused by

46. In reflection,

47. In light spectrum, the colour with longest wavelength is

48. Cutting diamond shows

49. In total internal reflection

50. Focal length of eyepiece lens in compound microscope is

51. Light pipe is based on

52. Pigment produced by infrared ray is

53. The critical angle of water is

54. In myopia, image is formed

55. Which mirror is used for shaving ?

56. The incident ray making an angle to the surface is called

57. Wavelength of red colour is

58. Which is visible ?

59. Luminous body is

60. The refractive index of glass is

61. Magnification is equal to