What is Brewster’s Law?

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Brewster’s Law states that when unpolarized light is incident on a transparent surface at the polarizing angle i_B, the reflected and refracted rays are perpendicular to each other.
      tan i_B=μ
where i_B is the Brewster angle and μ is the refractive index of the medium.
Key point: At Brewster angle, the reflected light is completely plane polarized.

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