If refractive indices of glass and water with respect to air are `3//2` and `4//3` respectively, what is the refractive index of glass with respect to water ?

Explanation

Here, `._(g)mu^(a) = (3)/(2)` and `._(w)mu^(a) = (4)/(3)`
`._(g)mu^(w) = (._(g)mu^(a))/(._(w)mu^(a)) = (3//2)/(4//3) = (9)/(8)`