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

Answer 1

The correct option is B

$\frac{9}{8}$

Refractive Index of glass w.r.t water $=\frac{\text{Refractive index of glass}}{\text{Refractive index of water}}$
or, ${}^W{\mu }_g=\frac{{\mu }_g}{{\mu }_W}=\frac{\frac{3}{2}}{\frac{4}{3}}=\frac{9}{8}$
Hence, the correct option is 'B'.