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JEE Main 2024 (31 Jan, Shift 2) · Polarisation

Polarisation question from JEE Main 2024 (31 Jan, Shift 2)

Q30JEE Main 2024 · 31 JAN · SHIFT 2Easy

Polarisation

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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Answer: (c)

  1. Completely polarised reflected ray means incidence at Brewster angle, so reflected and refracted rays are perpendicular.
  2. ip+r=90∘⇒r=90∘−60∘=30∘i_p + r = 90^\circ \Rightarrow r = 90^\circ - 60^\circ = 30^\circ
  3. So the answer is (c) 30∘30^\circ.
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