Out of air and glass, which is optically rarer? Give reason.
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Air is optically rarer than glass as speed of light is more in air (3 x 108 m s-1) than the speed of light in glass (2 x 108 m s-1).
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How does the speed of light determine the optical density of a medium?
Which is optically denser: water or air? Give reason.
What do you understand by refraction of light?
Define the following terms:
(a) Incident ray
(b) Refracted ray
(c) Angle of incidence
(d) Angle of refraction