Refraction and Refractive index?

Question

Given that the angle of refraction is 14 degrees and the angle of incidence is 54 degrees(for light entering a slab of glass), find the refractive index for the light entering the glass.

How do you figure it out??

Answer 1

(Assuming the refractive index of air is 1)

sin (Ai) = N sin (Ar)

Solve for N. I get N = 3.3441