Question

A ray of light enters from, vacuum to glass of absolute refractive index 1.5. Find the speed of light in glass. The speed of light in vacuum is 3 × 10⁸ m/s.

Answer 1

Given:

Absolute refractive index of glass (`n`) = 1.5

Speed of light in vacuum (`c`) = 3 × 10⁸ m/s

To find the speed of light in glass (v), we rearrange the formula for the absolute refractive index:

`n = c/v`

Substituting the given values

`v = (3 xx 10^8)/1.5` = 2 × 10⁸ m/s.

So, the speed of light in glass is 2 × 10⁸ m/s.