A 60 ^$\circ$ Prism Has a Refractive Index of 1 $\circ$

Multiple Choice

A 60 ^$\circ$ prism has a refractive index of 1.71.Calculate the angle of emergence out of the prism for a ray that enters one side at an angle almost parallel to one face,i.e.at 90 ^$\circ$ to the normal.

A) 24.3 ^$\circ$
B) 35.8 ^$\circ$
C) 45.1 ^$\circ$
D) 48.7 ^$\circ$
E) 55.3 ^$\circ$