Question

the refractive index of water is 4/3 and speed of light in air is 3*108m/s. Find the speed of light in water.

Answer 1

Hope this helps you.

Answer 2

Given, refractive index of water = 4/3

Speed of light in air = 3 x 10^8

Let, speed of light in water = s

Now, using formula,

Refractive index = speed of light in air/ speed of light in medium(given)

4/3 = 3 x 10^8 / s

s = 9 x 10^8 / 4 [cross multiplying]

s = 2.25 x 10^8 m/sec