Question

The refractive index of glass is 1.5. What is the speed of light in glass? Speed of light in vacuum is 3.0 x 108 m/s.

A 2 x 10^8 m/s
B 2 x 10^3 m/s
C 2 x 10^7 m/s
D 2 x 10^9 m/s
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