A Light Ray in Air Strikes a Glass Surface with an Angle

Multiple Choice

A light ray in air strikes a glass surface with an angle of incidence of $30.0^{\circ}$ . The angle of refraction in the glass is $20.0^{\circ}$ . What is the index of refraction of the glass?

A) 1.46
B) 1.67
C) 1.55
D) 1.52
E) 1.24