Question

if the refractive index of water with respect to air is 4/3,what is the refractive index of air with respect to water ?

Answer 1

Given,
$$\begin{gathered} \mathrm{Refractive}\mathrm{index}\mathrm{of}\mathrm{water}\mathrm{with}\mathrm{respect}\mathrm{to}\mathrm{air},{\mathrm{a}}^{\mathrm{n}}\mathrm{w}=\frac{4}{3} \\ \mathrm{So}, \\ \mathrm{Refractive}\mathrm{index}\mathrm{of}\mathrm{air}\mathrm{with}\mathrm{respect}\mathrm{to}\mathrm{water}\mathrm{will}\mathrm{be}, \\ {\mathrm{w}}^{\mathrm{n}}\mathrm{a}=\frac{1}{{\mathrm{a}}^{\mathrm{n}}\mathrm{w}}=\frac{1}{4/3}=\frac{3}{4}=0.75 \end{gathered}$$