Question

light enters from air to water having refractive index 1.33,what is the speed of light in water?

Answer 1

refractive index of water with respect to air = 1.33  

speed of light in vaccum = 3*10^8  

1.33 = speed of light in vaccum/speed of light in air

speed of light in air = 3*10^8 / 1.33

ans.2.26*10^8 m/s

A.D

Answer 2

Answer:

2.25 × 10⁸ m / sec

Explanation:

Given :

Refractive index of water = 1.33

Speed of light in air = 3 × 10⁸ m / sec.

We know :

Refractive index = Speed of light in air / Speed of light in water

Speed of light in water = Speed of light in air / Refractive index.

Putting value we get :

Speed of light in water = 3 × 10⁸ m / sec / 1.33 .

Speed of light in water = 2.25 × 10⁸ m / sec

Hence speed of light in water is 2.25 × 10⁸ m / sec