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Saturday, 31 October

JEE Main 2022 · PhysicsMultiple choiceSingle correctMediumApplication

JEE Main 29 June 2022, Shift 2, Physics Q34

Question 34 of 90 in this shift, Physics question 4 of 30, Section A.

The speed of light in media ‘AA’ and ‘BB’ are 2.0 × 101010^{10} cm/scm/s and 1.5 × 101010^{10} cm/scm/s respectively. A ray of light enters from the medium BB to AA at an incident angle ‘θ’. If the ray suffers total internal reflection, then
  1. (1)θ=sin⁡−1(34)\theta=\sin^{-1}\left(\dfrac{3}{4}\right)
  2. (2)θ>sin⁡−1(23)\theta>\sin^{-1}\left(\dfrac{2}{3}\right)
  3. (3)θ<sin⁡−1(34)\theta<\sin^{-1}\left(\dfrac{3}{4}\right)
  4. (4)θ>sin⁡−1(34)\theta>\sin^{-1}\left(\dfrac{3}{4}\right)Official answer

Official answer

Option 4

NTA final key.

Same idea in other shifts

Asked 2× in all
  1. 26 Jul 2022, Shift 2 · Q37Light travels in two media M1M_1 and M2M_2 with speeds 1.5×108 ms−11.5 \times 10^{8}\ ms^{-1} and 2.0×108 ms−12.0 \times 10^{8}\ ms^{-1} respectively. The…EasySingle 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.