JEE Main 2021 · PhysicsMultiple choiceSingle correctEasyApplication

JEE Main 3 August 2021, Shift 1, Physics Q16

Question 16 of 90 in this shift, Physics question 16 of 30, Section A.

A beam of light is incident on the surface of a transparent liquid at an angle of 60°. The reflected and refracted lights are found to be perpendicular to each other. The refractive index of transparent liquid is -

(1) $\sqrt{5}$
(2) $\sqrt{3}$ Official answer
(3) $\sqrt{2}$
(4)1

Official answer

Option 2

NTA final key.

Chapter: Ray Optics and Optical Instruments
Topic: Polarization
Idea tested: Brewster's Angle

Same idea in other shifts

Asked 3× in all

31 Jan 2024, Shift 2 · Q45When unpolarized light is incident at an angle of $60^\circ$ on a transparent medium from air, the reflected ray is completely polarized.…EasySingle correct
25 Jun 2022, Shift 2 · Q45A light whose electric field vectors are completely removed by using a good polaroid, allowed to incident on the surface of the prism at…MediumSingle correct

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.