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Saturday, 31 October

JEE Main 2024 · PhysicsNumerical answerNumerical valueMediumCalculation

JEE Main 9 April 2024, Shift 2, Physics Q52

Question 52 of 90 in this shift, Physics question 22 of 30, Section B.

Monochromatic light of wavelength 500500 nm is used in Young's double slit experiment. An interference pattern is obtained on a screen. When one of the slits is covered with a very thin glass plate (refractive index = 1.5), the central maximum is shifted to a position previously occupied by the 4th4^{\text{th}} bright fringe. The thickness of the glass-plate is ___________ μ\mum.

Official answer

4

NTA final key.

Chapter
Wave Optics
Topic
Young's Double Slit
Idea tested
Fringe Shift by Thin Slab

Same idea in other shifts

Asked 3× in all
  1. 4 Apr 2026, Shift 2 · Q50In a double slit experiment, when one of the slits is covered by a transparent mica sheet of refractive index 1.56, the central fringe…MediumNumerical value
  2. 28 Jun 2022, Shift 2 · Q46In young’s double slit experiment performed using a monochromatic light of wavelength λ\lambda, when a glass plate (μ\mu=1.5) of…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.