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Friday, 9 October

JEE Main 2026 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 4 April 2026, Shift 1, Physics Q33

Question 33 of 75 in this shift, Physics question 8 of 25, Section A.

A slit of width aa is illuminated by light of wavelength λ\lambda. The linear separation between 1st1^{\text{st}} and 3rd3^{\text{rd}} minima in the diffraction pattern produced on a screen placed at a distance DD from the slit system is ______.
  1. (1)Dλa\frac{D\lambda}{a}
  2. (2)1.5Dλa1.5\frac{D\lambda}{a}
  3. (3)2Dλa2\frac{D\lambda}{a}Official answer
  4. (4)3Dλa3\frac{D\lambda}{a}

Official answer

Option 3

NTA final key.

Chapter
Wave Optics
Topic
Single Slit Diffraction
Idea tested
Single Slit Minima Condition

Same idea in other shifts

Asked 3× in all
  1. 2 Apr 2025, Shift 1 · Q50If the measured angular separation between the second minimum to the left of the central maximum and the third minimum to the right of the…MediumNumerical value
  2. 8 Apr 2024, Shift 1 · Q59A parallel beam of monochromatic light of wavelength 600 nm passes through single slit of 0.4 mm width. Angular divergence corresponding…EasyNumerical value

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.