Question

The velocity of light in vaccum is 300000km/sec and in diamond the velocity of light is 124000km/sec then find the refractive index of diamond

Answer 1

refractive index=speed of light in vacuum/speed of light in any medium
= 300000/124000
=2.42(approx)

Answer 2

n=c/v
refractive index of diamond=speed of light in vaccum/speed of light in diamond
                                          =300000/124000
                                          =75/31
refractive index of diamond=75/31