Question

Monochromatic light is refracted from air into the glass of refractive index $\mu$. The ratio of the wavelength of incident and refracted waves is:

Answer 1

Given, Refractive index =$\mu$

A/C to the Snail's law $\frac{sini}{sinr}=\mu =\frac{v_1}{v_2}$

Where $v_1$ and $v_2$ is the speed of light rays respectively,

So usin the fact that the speed is directly proportional to the wavelength then we get,

$\frac{{\lambda }_1}{{\lambda }_2}=\frac{v_1}{v_2}=\mu$