The velocity of light in water is 3/4 times the velocity of light in vacuum. Find the refractive index of water.

Question

The velocity of light in water is \(\frac34\)times the velocity of light in vacuum. Find the refractive index of water.

Answer 1

Let velocity of light in vacuum = v 

⇒ Velocity of light in water = \(\frac34\) v

Now,

Refractive index of a medium (water) = \(\frac{Speed\,of\,light\,in\,vacuum}{Speed\,of\,light\,in\,meium\,(water)}\)

⇒ Refractive index = \(\frac34\) = 1.33 ...

Hence Refractive index of water = 1.33.