A light beam containing red and violet wavelengths is incident
on a slab of quartz at an angle of incidence of 37.3°. The index of
refraction of quartz is 1.455 at 600 nm (red light), and its index
of refraction is 1.468 at 410 nm (violet light). Find the
dispersion of the slab, which is defined as the difference in the
angles of refraction for the two wavelengths.