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Saturday, 31 October

JEE Main 2021 · PhysicsMultiple choiceSingle correctMediumConceptual

JEE Main 25 February 2021, Shift 2, Physics Q14

Question 14 of 90 in this shift, Physics question 14 of 30, Section A.

Consider the diffraction pattern obtained from the sunlight incident on a pinhole of diameter 0.1 µm. If the diameter of the pinhole is slightly increased, it will affect the diffraction pattern such that :
  1. (1)its size increases, and intensity increases
  2. (2)its size increases, but intensity decreases
  3. (3)its size decreases, but intensity increasesOfficial answer
  4. (4)its size decreases, and intensity decreases

Official answer

Option 3

NTA final key.

Chapter
Wave Optics
Topic
Single Slit Diffraction
Idea tested
Angular Width of Central Max

Same idea in other shifts

Asked 3× in all
  1. 2 Apr 2026, Shift 1 · Q46In single slit diffraction pattern, the wavelength of light used is 628628 nm and slit width is 0.20.2 mm, the angular width of central…EasyNumerical value
  2. 1 Feb 2024, Shift 2 · Q45A microwave of wavelength 2.0 cm falls normally on a slit of width 4.0 cm. The angular spread of the central maxima of the diffraction…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.