Question

Refractive index of water is $\frac{4}{3}$ and of glass is $\frac{3}{2}$. What is the refractive index of glass w.r.t water?

• A. $\frac{8}{11}$
• B. $\frac{11}{8}$
• C. $\frac{8}{9}$
• D. $\frac{9}{8}$

Answer 1

The correct option is D $\frac{9}{8}$

Refractive index of glass w.r.t water

$=\frac{\text{Refractive index of glass}}{\text{Refractive index of water}}$
or,
$n_{gw}=\frac{n_g}{n_w}=\frac{\frac{3}{2}}{\frac{4}{3}}=\frac{9}{8}$

Hence, the correct option is b.