question_answer

How is the refractive index of a medium related to the wavelength of incident light?

Answer:

                The refractive index \[\mu \] of a material is related to wavelength \[\lambda \] by the Cauchy's relation: \[\mu =a+\frac{b}{{{\lambda }^{2}}}+\frac{c}{{{\lambda }^{4}}}\] where\[a,b\] and \[c\] are constants which depend on the nature of the material.