The refractive index of glass with respect to air is $\frac{3}{2}$. The refractive index of air with respect to glass will be?

Q. Refractive index of glass with respect to water is $\frac{9}{8}$ and refractive index of glass with respect to air is $\frac{3}{2}$. The refractive index of water with respect to air will be

Q. The refractive index of air with respect to glass is 2/3.The refractive index of diamond with respect to air is 12/5.Then the refractive index of glass with respect to diamond will be :

Q. If the refractive index of glass with respect to air is $3/2$, what is the refractive index of air with respect to glass?