Light Strikes a Diamond (N = 2 $\degree$ Relative to the Normal to the Surface

Multiple Choice

Light strikes a diamond (n = 2.42) immersed in glycerin (n = 1.473) at an angle of 60 $\degree$ relative to the normal to the surface.What is the angle of refraction?

A) 20 $\degree$
B) 60 $\degree$
C) 32 $\degree$
D) 64 $\degree$
E) 15 $\degree$