The refractive index of water with respect to air is a${}^{\mu }w$ and a glass with respect to air is a${}^{\mu }g$. Express the refractive index of glass with respect to water.

Q. The refractive index of water with respect to air is ${}_a{\mu }_w$ and of glass with respect to air is ${}_a{\mu }_g$. So, $\frac{{}_a{\mu }_g}{{}_a{\mu }_w}$ should express:

Q. Refractive index of glass with respect to water is $\left(9/8\right).$Refractive index of glass with respect to air is $\left(3/2\right)$. Find the refractive index of water with respect to air.

Q. Refractive index of glass with respect to water is 5/4 and the refractive index of water with respect to air is 4/3, what is the refractive index of glass with respect to air?