10th Class Physical Science Chapter wise Important bit bank in English

21. Total internal reflection is the basic principle behind working of __________.

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optical fiber

22. An optical fiber is very thin fiber made of ____________ having radius about a micrometer.

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glass (or) plastic

23. One Micrometer is equeal to ______ m.

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10-6

24. A bunch of optical thin fibers form a __________.

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light pipe

25. When light is entered into optical fiber, the angle of incidence is greater than the critical angle and hence ______________ takes place.

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total internal reflection

26. The distance between the parallel rays in a glass slab is called ____________.

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lateral shift

27. The refractive index of a glass slab is calculated by using the formula, = ___________

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\frac { Thickness of the slab }{ thickness of slab - vertical shift }

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 __________________.

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total internal reflection

29. The refractive index of air is ___________

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1.0003

30. The refractive index of Ice is __________

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1.31

31. The refractive index of Rock salt is _________

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1.54

32. The refractive index of Water is _______

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1.33

33. The refractive index of Kerosene is _________

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1.44

34. The refractive index of Turpentine oil is ________

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1.47

35. The refractive index of Crown glass is ________

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1.52

36. The refractive index of Diamond is ______

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2.42

37. At critical angle of incidence, the angle of refraction is

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90 degress

38. n1 sin i = n2 sin r, is called __________.

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Snell’s law

39. Speed of light in vaccum is ________ m/s.

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3×108

40. Total internal reflection takes place when a light ray propagates from ________ to _________ medium.

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denser , rarer

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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2×108
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