Question

Refractive index of glass relative to water is $9/8$. What is the refractive index of water relative to glass?

Answer 1

Given: refractive index of glass relative to water is $\frac{9}{8}$

To find the refractive index of water relative to glass

Solution:

We know,

Refractive index of glass relative to water, ${}^w{\mu }_g=\frac{{\mu }_g}{{\mu }_w}=\frac{9}{8}$

Refractive index of water relative to glass, ${}^g{\mu }_w=\frac{{\mu }_w}{{\mu }_g}=\frac{1}{\frac{{\mu }_g}{{\mu }_w}}=\frac{1}{{}^w{\mu }_g}=\frac{8}{9}$