Parallel beam containing light of $\lambda = 400\,\,{\rm{nm}}$  and  ${\rm{500}}\,\,{\rm{nm}}$ is incident on a prism as shown in figure. The refractive index  ${\rm{\mu }}$ of the prism is given by the relation<br />${\rm{\mu }}\,\,\left( {\rm{\lambda }} \right) = 1.20\,\, + \,\,\frac{{0.8\,\, \times \,\,{{10}^{ - 14}}}}{{{\lambda ^2}}}$<br />Which of the following statement is correct ?<br /> 