Question

The speed of light in a diamond is 124000 km find the refractive index of diamond is the speed of light in air is 300000 km

Answer 1

Refractive index of diamond = Speed of light in air / Speed of light in diamond
= 300000km / 124000km
= 2.4

Answer 2

Given that,

The speed of light in a diamond is 124000 km/s

The speed of light in air is 300000 km/s

To find,

The refractive index of diamond.

Solution,

The ratio of speed of light in air to the speed of light in a material is equal to refractive index of the material. So,

$n=\dfrac{c}{v}\\\\n=\dfrac{300000\ km}{124000\ km}\\\\n=2.41$

So, the refractive index of diamond is 2.41.