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Question

A ray of light enters from air to a medium X. The speed of light in the medium is 1.5×108m/s and the speed of light in air is 3×108m/s. Find the Refractive index of the medium X.

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Solution

According to Snell's Law,
Refractive index of a medium X=cv where c is speed of light in air and v is speed of light in medium X.
So, Refractive Index of X=3×1081.5×108=2

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