JEE Main 2022 · PhysicsMultiple choiceSingle correctMediumCalculation

JEE Main 27 June 2022, Shift 1, Physics Q47

Question 47 of 90 in this shift, Physics question 17 of 30, Section A.

Consider a light ray travelling in air is incident into a medium of refractive index

\sqrt{2n}

. The incident angle is twice that of refracting angle. Then, the angle of incidence will be :

(1) $\sin^{-1}(\sqrt{n})$
(2) $\cos^{-1}\left(\sqrt{\frac{n}{2}}\right)$
(3) $\sin^{-1}(\sqrt{2n})$
(4) $2\cos^{-1}\left(\sqrt{\frac{n}{2}}\right)$ Official answer

Official answer

Option 4

NTA final key.

Chapter: Ray Optics and Optical Instruments
Topic: Refraction and Snell's Law
Idea tested: Snell's Law Application

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Asked 4× in all

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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.