Question

Find the refractive index of glass with respect to water.
The refractive index of glass with respect to air is $\frac{3}{2}$ and the refractive index of water with respect to air is $\frac{4}{3}$ respectively.

• A. $\frac{8}{9}$
• B. $\frac{4}{9}$
• C. $\frac{9}{4}$
• D. $\frac{9}{8}$

Answer 1

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

We have, $n_{21}=\frac{n_2}{n_1}$.Here, glass is the second medium.
Here, $n_2=\frac{3}{2},n_1=\frac{4}{3}$
So, $n_{21}=\frac{9}{8}$