When unpolarized light is incident at an angle of 60 ° on a transparent medium from air. The reflected ray is completely polarized. The angle of refraction in the medium is

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By Brewster’s law at complete polarization, refracted ray and reflected ray are perpendicular to each other.

As angle of reflection will be $= 60 °$ . Therefore, angle of refraction will be $= 180 ° - 60 ° - 90 ° = 30 °$ .

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