Question

The refractive index of water with respect to air is $\frac{4}{3}$. The refractive index of air with respect to water will be:

(a) 1.75
(b) 0.50
(c) 0.75
(d) 0.25

Answer 1

(c) 0.75

Explanation:
Refractive index of air with respect to water = $\frac{1}{\mathrm{Refractive}\mathrm{index}\mathrm{of}\mathrm{water}\mathrm{with}\mathrm{respect}\mathrm{to}\mathrm{air}}$


Refractive index of air with respect to water = 3/4 = 0.75