An unpolarized light beam travelling in air is incident on a medium of refractive index 1.73 at Brewster's angle. Then (a) Both reflected and transmitted light are perfectly polarized with angles of reflection and refraction close to 60° and 30°, respectively (b) Transmitted light is completely polarized with angle of refraction close to 30° (c) Reflected light is completely polarized and the angle of reflection is close to 60° (d) Reflected light is partially polarized and the angle of reflection is close to 30°

Answer: (c). Brewster's law: tan ip = 1.73 = √(3) ⇒ ip = 60°, so the angle of reflection is 60°. At this angle the reflected light is completely polarised; the transmitted light is only partially polarised. So the answer is (c).

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Polarisation

An unpolarized light beam travelling in air is incident on a medium of refractive index 1.73 at Brewster's angle. Then

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Answer: (c)

Brewster's law: $\tan i_p = 1.73 = \sqrt{3} \Rightarrow i_p = 60^\circ$ , so the angle of reflection is $60^\circ$ .
At this angle the reflected light is completely polarised; the transmitted light is only partially polarised.
So the answer is (c).

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