Question

If the incident ray makes the same angle with normal of two interfaces,air-water interface & air-diamond interface, in which medium value of 'angle of refralow?' is low ?

Answer 1

The angle of incidence, the angle of refraction and the refractive index is related as:
$\frac{sini}{sinr}=\mu$
Therefore angle of refraction will be lesses if the medium has a higher refractive index.Since diamond has a very high refractive index, it will have a smaller angle of refraction.