Question

A ray of light enters into a glass slab of refractive index μ from air. If c is the speed of light in air, then the speed of light in glass slab is​

Answer 1

The speed of light in the glass lab is c / μ.

Explanation:

We are given that:

• The refractive index of a ray of light when it enters from air = μ
•  If the speed of light in air = c
• To find: The speed of light in glass slab

Solution:

The refractive index = the ratio of speed of light in air / the ratio of speed of light in vacuum.

Therefore we can say that

Refractive index of glass slab = The speed of light in air / The speed of light in glass slab

μ = c / speed of light in glass slab

Speed of light in glass slab = c / μ

Thus the speed of light in glass lab is c / μ.