Question

Velocity of light in water is 3/4 times the velocity of light in vaccum.find the refractive index of water

Answer 1

Suppose velocity of light in vacuum=v

Then velocity of light in water=3/4 v

Now we have a relation:

Refractive index of a medium(water)=Speed of light in vacuum / Speed of light in medium(water)

so v/3/4v= 1.33

Answer 2

Answer is as follows