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?
Describe an experiment to show that a light ray bends when it passes from one transparent medium into another transparent medium.
What do you understand by refraction of light?
Which is optically denser: water or air? Give reason.