Problem

A bird in air looks at a fish directly below it inside in a transparent liquid in a tank. If the distance of the fish as estimated by the bird is

h_1

and that of the bird as estimated by the fish is

h_2

, then the refractive index of the liquid is a.

\frac{h_2}{h_1}

\frac{h_1}{h_2}

\frac{h_1 + h_2}{h_1 - h_2}

\frac{h_1 - h_2}{h_1 + h_2}