A narrow beam of light with wavelengths from 450 nm
to 700 nm
is incident perpendicular to one face of a prism made of crown glass, for which the index of refraction ranges from n
= 1.533 to n
= 1.517 for those wavelengths. The light strikes the opposite side of the prism at an angle of 36.0 ∘
.What is the angular spread of the beam as it leaves the prism? Express your answer in degrees.