41. What is the reason for twinkling of stars ?
42. The basic reason for the extraordinary sparkle of suitably cut diamond is that
43. Refractive Index of glass with respect to water is
44. Which of the following colour of light deviates least through the prism?
45. Bending of light rays in denser medium is termed as:
46. The absolute refractive index of any medium is always:
47. Lens is made up of
48. 'Mirage' is an example of
49. Mirage is due to
50. A water tank appears shallower when it is viewed from top due to
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