An equilateral prism of apex angle 60^° is made of glass whose refractive index varies with wavelength as n(λ)=1.50+(B)/(λ^2, with B=5.0×10^3 nm^2. A…

An equilateral prism of apex angle $60^\circ$ is made of glass whose refractive index varies with wavelength as $n(\lambda)=1.50+\dfrac{B}{\lambda^{2}}$, with $B=5.0\times10^{3}\ \mathrm{nm^{2}}$. A parallel beam containing the wavelengths $400\ \mathrm{nm}$ and $600\ \mathrm{nm}$ is incident on the prism from air, and each wavelength is rotated into its own position of minimum deviation. Find the difference, in degrees, between the minimum deviations of the two wavelengths. Give the answer correct to two decimal places.