Question

Refractive index of water with respect to air is $\frac{4}{3}$. Find refractive index of air with respect to water.

Answer 1

Given = refractive index of water w.r.t. air

${}_{air}{\mu }_{water}=\frac{4}{3}$

$\therefore$ refractive index of air w.r.t is:

${}_{water}{\mu }_{air}=\frac{1}{{}_{air}{\mu }_{water}}=\frac{3}{4}=0.75$