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**Hint:**For visible light \[\lambda \] is smallest for violet and greatest for red light.

**Complete step by step solution:**According to Cauchy equation

\[\mu = A + \dfrac{B}{{{\lambda ^2}}}\]

\[\mu \to \]refractive index

\[\lambda \to \]wavelength

For visible light \[\lambda \] is smallest for violet light and greatest for red light.

Hence \[\dfrac{B}{{\lambda _{red}^2}} < \dfrac{B}{{\lambda _{violet}^2}}\]

Thus, \[{\mu _{red}} < {\mu _{violet}}\]

i.e. µ is maximum for violet colour

**Option (C) is correct.**

**Note:**The refractive index of glass \[{n_g}\] is 1.52 and that of water \[{n_w}\] is 1.33. Since the refractive index of glass is higher than the water, the speed of light in water is faster than the speed of light through glass. The refractive index provides a measure of the relative speed of light in different mediums.

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