A Prism Has a Vertex Angle of 60° and an Index

Multiple Choice

A prism has a vertex angle of 60° and an index of refraction of 1.52. What is the minimum angle of incidence, measured away from the vertex, for a ray of light to emerge from the other side of the prism?

A) 25.6°
B) 38.7°
C) 29.4°
D) 32.1°
E) 33.3°