Question

The refractive index of water is 1.33 and speed of light in air is 3 into 10 raise to 8 metre per sec .calculate rhe speed of light in water.

Answer 1

refractive index=speed of light in vacuum/ speed of light in water
speed of light in water=speed of light in vacuum/ refractive index
=3*10^8 / 1.33=3*10^10/133=225563910m per sec

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