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2015-04-28T19:53:50+05:30

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Refractive index of a transparent medium is defined as the ratio of the Speed of light in vacuum to the speed of light in the medium.

   1.50 = speed of light in vacuum / speed of light in glass
        
Speed of light in glass = 3 * 10^8 m/sec  / 1.50 = 2 * 10^8 m/sec

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