Physics - Wave Optics Question with Solution | TestHub

According to Brewster's law, the tangent of the polarizing angle (Brewster's angle) is equal to the refractive index of the medium.

$\tan {\theta }_B=\mu$

The refractive index $\mu$ of a transparent medium depends on the wavelength of the incident light according to Cauchy's relation:

$\mu =A+\frac{B}{{\lambda }^2}+\dots$

Since different colours of light have different wavelengths $\lambda$, the refractive index $\mu$ is different for different colours. Consequently, Brewster's angle ${\theta }_B$ is different for light of different colours.

Answer: different for light of different colours