For a given pair of transparent media,the cri | vedclass

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(B) The critical angle $C$ is given by the formula $\sin C = \frac{1}{\mu}$,where $\mu$ is the refractive index of the denser medium with respect to t

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Red

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(B) The critical angle $C$ is given by the formula $\sin C = \frac{1}{\mu}$,where $\mu$ is the refractive index of the denser medium with respect to the rarer medium.Since $\mu$ is inversely proportional to the wavelength $\lambda$ (Cauchy's equation),the refractive index is minimum for the colour with the longest wavelength.Red light has the longest wavelength in the visible spectrum,which results in the smallest refractive index $\mu$ for red light.Because the critical angle $C = \arcsin(1/\mu)$ is inversely related to the refractive index,the smallest $\mu$ corresponds to the maximum critical angle.Therefore,the critical angle is maximum for red light.

For a given pair of transparent media,the critical angle is maximum for which colour?

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