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Saturday, 31 October

JEE Main 2022 · PhysicsMultiple choiceSingle correctMediumCalculation

JEE Main 25 June 2022, Shift 1, Physics Q49

Question 49 of 90 in this shift, Physics question 19 of 30, Section A.

The difference of speed of light in the two media A and B (vA−vBv_A-v_B) is 2.6×1072.6\times10^7 m/s. If the refractive index of medium B is 1.47, then the ratio of refractive index of medium B to medium A is : (Given : speed of light in vacuum c=3×108 ms−1c=3\times10^8\ \mathrm{ms^{-1}})
  1. (1)1.303
  2. (2)1.318
  3. (3)1.13Official answer
  4. (4)0.12

Official answer

Option 3

NTA final key.

Chapter
Ray Optics and Optical Instruments
Topic
Refraction and Snell's Law
Idea tested
Refractive Index and Speed

Same idea in other shifts

Asked 3× in all
  1. 4 Apr 2025, Shift 2 · Q47If an optical medium possesses a relative permeability of 10π\frac{10}{\pi} and relative permittivity of 10.0885\frac{1}{0.0885}, then the…MediumNumerical value
  2. 7 Apr 2025, Shift 2 · Q41Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Refractive…EasyAssertion–reason

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.