Question

The refractive index of glass is 1.2. What is the meaning of this statement

Answer 1

μ = 1.2

μ = Speed of light in vaccum/ Speed of light in Medium

1.2 = (3 * 10⁸)/V

V = (3 * 10⁸)/1.2

V = 2.5 * 10⁸ m/s

It means speed of light in another medium is 2.5 * 10⁸ m/s