A Narrow Light Beam in Vacuum Contains Light of Two $480 \mathrm {~nm}$

Short Answer

A narrow light beam in vacuum contains light of two wavelengths, $480 \mathrm {~nm}$ and $700 \mathrm {~nm}$ . It strikes a flat piece of glass at an angle of incidence of $60.000 ^ { \circ }$ . The index of refraction of the glass is $1.4830$ at $480 \mathrm {~nm}$ and $1.4760$ at $700 \mathrm {~nm}$ . Determine the angle between the two wavelengths as the light travels in the glass.