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Question
An unpolarised light beam travelling in air is incident on a medium of refractive index 1.73 at Brewster’s angle. Then, ______.
Options
reflected lights is completely polarised and the angle of reflection is close to 60°.
reflected light is partially polarised and the angle of reflection is close to 30°.
both reflected and transmitted lights are perfectly polarised with angles of reflection and refraction closer to 60° and 30°, respectively.
transmitted light is completely polarised with angle of refraction close to 30°.
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Solution
An unpolarised light beam travelling in air is incident on a medium of refractive index 1.73 at Brewster’s angle. Then, reflected light is completely polarised and the angle of reflection is close to 60°.
Explanation:
When unpolarised light is incident at polarising (Baewster's) angle, the reflected light is completely polarised and the transmitted light is partially polarised.
From theory
`tan i_p = sqrt3 = 1.73`
ip = 60
According to the law of reflection,
r = ip
= 60°
