JEE Main 2015 Physics question

Unpolarized light of intensity is incident on surface of a block of glass at Brewster's angle. In that case, which one of the following statements is true?

(1)transmitted light is partially polarized with intensity
(2)transmitted light is completely polarized with intensity less than
(3)reflected light is partially polarized with intensity
(4)reflected light is completely polarized with intensity less than Correct

Answer: (4)

Solution

At Brewster's angle the reflected ray and the refracted ray are perpendicular to each other, and the component of the electric field parallel to the plane of incidence cannot be reflected at all. The reflected beam is therefore *completely* plane-polarized, with its vibrations perpendicular to the plane of incidence.

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Question ID VK-115340