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Brewster's angle: angle of incidence or refraction when reflected light is fully polarised

This type of question, asked 4 times: 29 Jan 2023, 31 Jan 2024, 23 Jan 2026 S2, 24 Jan 2026 S1. All 4 questions below, oldest first.

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  1. Question 1

    29 Jan 2023

    112
    Unpolarised light is incident on the boundary between two dielectric media, whose dielectric constants are 2.8 (medium -1 ) and 6.8 (medium -2 ), respectively. To satisfy the condition, so that the reflected and refracted rays are perpendicular to each other, the angle of incidence should be tan⁡−1(1+10θ)12\tan^{- 1}\left( 1 +\frac{10}{\theta} \right)^{\frac{1}{2}} the value of θ\theta is_____ (Given for dielectric media, μr=1\mu_{r}= 1 )

  2. Question 2

    31 Jan 2024

    96
    When unpolarized light is incident at an angle of 60∘60^{\circ} on a transparent medium from air. The reflected ray is completely polarized. The angle of refraction in the medium is

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  3. Question 3

    23 Jan 2026 S2

    19
    When an unpolarized light falls at a particular angle on a glass plate (placed in air), it is observed that the reflected beam is linearly polarized. The angle of refracted beam with respect to the normal is ____\_\_\_\_ . (tan⁡−1(1.52)=57.7∘\left( \tan^{- 1}(1.52) =57.7^{\circ} \right., refractive indices of air and glass are 1.00 and 1.52 , respectively)

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  4. Question 4

    24 Jan 2026 S1

    17
    An unpolarised light is incident at an interface of two dielectric media having refractive indices of 2 (incident medium) and 232\sqrt{3} (second medium) respectively. To satisfy the condition that reflected and refracted rays are perpendicular to each other, the angle of incidence is ____\_\_\_\_ .

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