Question

Find speed of light in glass if refractive index of kerosene is 1.4​

Answer 1

Explanation:

Given: Light enters from air to kerosene having refractive index of 1.47. The speed of light in air is 3×10

8

m/s

To find the speed of the light in kerosene

Solution:

We know,

Refractive index of the medium=

Speed of light in the medium

Speed of light in air

Hence,

Refractive index of the kerosene=

Speed of light in the kerosene

Speed of light in air

⟹1.47=

Speed of light in the kerosene

3×10

8

⟹Speed of light in the kerosene=

1.47

3×10

8

⟹Speed of light in the kerosene=2.04×10

8

m/s

is the required speed of light in kerosene