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

speed of light in the glass slab is c/μ.

Given : A ray of light enters into a glass slab of refractive index μ from air.

To find : The speed of light in glass slab If the speed of light in air is c.

solution : refractive index is the ratio of speed of light in air to speed of light in vacuum.

i.e., Refractive index of glass slab = speed of light in air/speed of light in glass slab

⇒μ = c/speed of light in glass slab

⇒speed of light in glass slab = c/μ

Therefore speed of light in the glass slab is c/μ

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