Question

The speed of light reduced to 0.5 times when it enters from air to another medium. Find the refractive index of medium.​

Answer 1

Given: The speed of light reduced to 0.5 times when it enters from air to another medium.

To find: Refractive index of the medium

Explanation: Refractive index of a medium signifies the speed of light in the medium with respect to speed in light. It is unitless and dimensionless.

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

=> Refractive index= Speed of light in air/ 0.5 * speed of light in air

=> Refractive index= 1/0.5

= 2

Therefore, the refractive index of the medium is 2.