Question

Find the speed of light in diamond whose absolute refractive index is 2.4

Answer 1

speed of light in vacuum = 3×10^8 m/s

So, Speed of light in diamond = 3×10^8/2.4
=30×10^8/24
=5×10^8/4
= 1.25×10^8 m/s


I hope its help you.

Answer 2

Velocity of light in medium= Velocity of light in vacuum/ Refractive index of medium
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Refractive index of medium = 2.4
speed of the light in vaccum = 3 x $10 ^{8}$

= 3 x 10^8 / 3.4

1.25 x 10 ^8 m/s