Question

The velocity of light in a medium is 2.25 × 10⁸ m/s. What is the refractive index of this medium?

Answer 1

Given:

Velocity of light in the medium (v) = 2.25 × 10⁸ m/s

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

Formula:

μ = `"Speed of light in vacuum (c)"/"Velocity of light in medium (v)"`

= `(3 xx 10^8)/(2.25 xx 10^8)`

= `3/2.25`

= `300/225`

= `4/3`

= 1.33

The refractive index of this medium is 1.33.