Question

The refractive index of water is 4/3. and of glass is 3/2. What is the refractive index of glass with respect to water?

Answer 1

Refractive index of water $n_w=\frac{4}{3}$

Refractive index of gas $n_g=\frac{3}{2}$

Refractive index of glass w.r.t. water $n_{gw}=\frac{n_g}{n_w}$

$⟹n_{gw}=\frac{3/2}{4/3}=\frac{9}{8}$