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Saturday, 31 October

JEE Main 2026 · PhysicsMultiple choiceSingle correctEasyApplication

JEE Main 5 April 2026, Shift 1, Physics Q39

Question 39 of 75 in this shift, Physics question 14 of 25, Section A.

In Young's double slit experiment, the fringe width of the interference pattern produced on the screen is 2.4 μ2.4\ \mum. If the experiment is carried out in another medium having refractive index 1.2, the fringe width will be ____ μ\mum.
  1. (1)1.2
  2. (2)2Official answer
  3. (3)2.4
  4. (4)2.88

Official answer

Option 2

NTA final key.

Chapter
Wave Optics
Topic
Young's Double Slit
Idea tested
Effect of Medium on Fringes

Same idea in other shifts

Asked 2× in all
  1. 26 Jul 2022, Shift 1 · Q35In Young's double slit experiment, the fringe width is 12 mm. If the entire arrangement is placed in water of refractive index…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.