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.
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