Unpolarized light of intensity I0 is incident on surface of a block of glass at Brewster's angle. In that case, which one of the following statements is true? (a) transmitted light is partially polarized with intensity I0/2. (b) transmitted light is completely polarized with intensity I0/2. (c) reflected light is completely polarized with intensity less than I0/2. (d) reflected light is partially polarized with intensity I0/2.

Answer: (c). At Brewster angle the reflected light is completely polarised (only the component perpendicular to the plane of incidence). Only part of that perpendicular component (which carries I₀/2) is reflected, so reflected intensity I₀/2. So the answer is (c).

Unpolarized light of intensity I0 is incident on surface of a block… | JEE Main 2015 (11 Apr, Shift 1)

Q57JEE Main 2015 · 11 APR · SHIFT 1Medium

Polarisation

Unpolarized light of intensity I0 is incident on surface of a block of glass at Brewster's angle. In that case, which one of the following statements is true?

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Answer: (c)

At Brewster angle the reflected light is completely polarised (only the component perpendicular to the plane of incidence).
Only part of that perpendicular component (which carries $I_0/2$ ) is reflected, so reflected intensity $< I_0/2$ .
The transmitted light has all of the parallel component plus the rest, so it is only partially polarised with intensity $> I_0/2$ .
So the answer is (c).

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Polarisation question from JEE Main 2015 (11 Apr, Shift 1)

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