Q. 73.8( 24 Votes )

Light enters from air to glass having refractive index 1.50. What is the speed of light in the glass? 1 speed of light in vacuum is 3 x 108 m s-1

Answer :

We know that:

Refractive index of glass = (Speed of light in air (or vacuum))/(Speed of light in glass)

1.50 = (3×108)/(Speed of light in glass)

Or, Speed of light in glass = = 2×108 ms-1

Thus, the speed of light in glass is 2×108 ms-1 (or 2×108 m/s).

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