Question

25. Find the velocity of light in diamond. Given the velocity of light in glass is 2 x 108 ms-1.
Given refractive index of glass with respect to air is 1.5 and that of diamond with respect
to air is 2.5.
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Answer 1

n=speed of light in vacuum /speed of light in medium

n=c/v

2.42=3x10^8/speed of light

Speed of light =3x108/2.42

=1.25x108 m/s