State Brewster’s law. The value of Brewster angle for a transpare… - Vidyadip

Question

State Brewster’s law.
The value of Brewster angle for a transparent medium is different for light of different colours. Give reason.

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Answer

When unpolarized light is incident on the surface separating two media, the reflected light gets (completely) polarised only when the reflected light and refracted light become perpendicular to each other.

The refractive index of denser medium, with respect to rarer medium, is given by $\mu = \tan\text{i}_{p}$
Since Refractive index (μ) of a transparent medium is different for different colours, hence Brewster angle is different for different colours.

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