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Friday, 9 October

JEE Main 2022 · PhysicsMultiple choiceSingle correctMediumMulti-step

JEE Main 25 July 2022, Shift 1, Physics Q46

Question 46 of 90 in this shift, Physics question 16 of 30, Section A.

Time taken by light to travel in two different materials A and B of refractive indices μA\mu_A and μB\mu_B of same thickness is t1t_1 and t2t_2 respectively. If t2−t1=5×10−10t_2-t_1=5\times10^{-10} s and the ratio of μA\mu_A to μB\mu_B is 1:21:2. Then, the thickness of material, in meter is : (Given vAv_A and vBv_B are velocities of light in A and B materials respectively.)
  1. (1)5×10−10 vA5\times10^{-10}\,v_A mOfficial answer
  2. (2)5×10−105\times10^{-10} m
  3. (3)1.5×10−101.5\times10^{-10} m
  4. (4)5×10−10 vB5\times10^{-10}\,v_B m

Official answer

Option 1

NTA final key (2022 Session 2).

Chapter
Ray Optics and Optical Instruments
Topic
Refraction and Snell's Law
Idea tested
Time of Flight in a Medium

Same topic in other shifts

All Refraction and Snell's Law questions
  1. 8 Apr 2026, Shift 2 · Q42Light ray incident along a vector AO→\overrightarrow{AO} (AO→=2i^−3j^)\left(\overrightarrow{AO} = 2\hat{i} - 3\hat{j}\right) emerges out along vector…MediumDiagram basedHas a figure
  2. 3 Apr 2025, Shift 2 · Q42A monochromatic light of frequency 5×10145 \times 10^{14} Hz travelling through air, is incident on a medium of refractive index '2'.…EasySingle correct
  3. 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
  4. 7 Apr 2025, Shift 1 · Q50A container contains a liquid with refractive index of 1.2 up to a height of 60 cm and another liquid having refractive index 1.6 is added…MediumNumerical value
  5. 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
  6. 7 Apr 2025, Shift 2 · Q42A transparent block A having refractive index μ=1.25\mu=1.25 is surrounded by another medium of refractive index μ=1.0\mu=1.0 as shown in figure.…MediumSingle correctHas a figure

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 42 of the 174 JEE Main shifts held from 2017 to 2026.