21. Total internal reflection is the basic principle behind working of __________.
22. An optical fiber is very thin fiber made of ____________ having radius about a micrometer.
23. One Micrometer is equeal to ______ m.
24. A bunch of optical thin fibers form a __________.
25. When light is entered into optical fiber, the angle of incidence is greater than the critical angle and hence ______________ takes place.
26. The distance between the parallel rays in a glass slab is called ____________.
27. The refractive index of a glass slab is calculated by using the formula, = ___________
28. When the angle of incidence is greater than the critical angle, the light ray is reflected into denser medium at interface. This phenomenon is called __________________.
29. The refractive index of air is ___________
30. The refractive index of Ice is __________
31. The refractive index of Rock salt is _________
32. The refractive index of Water is _______
33. The refractive index of Kerosene is _________
34. The refractive index of Turpentine oil is ________
35. The refractive index of Crown glass is ________
36. The refractive index of Diamond is ______
37. At critical angle of incidence, the angle of refraction is
38. n1 sin i = n2 sin r, is called __________.
39. Speed of light in vaccum is ________ m/s.
40. Total internal reflection takes place when a light ray propagates from ________ to _________ medium.
41. The refractive index of a transparent material is 3/2. The speed of the light in that medium is __________ m/s.
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