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JEE Main 30 January 2024, Shift 1, Physics Q45

Question 45 of 90 in this shift, Physics question 15 of 30, Section A.

The diffraction pattern of a light of wavelength 400 nm diffracting from a slit of width 0.2 mm is focused on the focal plane of a convex lens of focal length 100 cm. The width of the

1^{\mathrm{st}}

secondary maxima will be :

(1)2 mmOfficial answer
(2)0.2 mm
(3)0.02 mm
(4)2 cm

Official answer

Option 1

NTA final key.

Chapter: Wave Optics
Topic: Single Slit Diffraction
Idea tested: Width of Secondary Maxima

Same topic in other shifts

All Single Slit Diffraction questions

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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
4 Apr 2025, Shift 2 · Q46In a Young's double slit experiment, two slits are located 1.5 mm apart. The distance of screen from slits is 2 m and the wavelength of…MediumNumerical value
5 Apr 2024, Shift 2 · Q53In a single slit experiment, a parallel beam of green light of wavelength 550 nm passes through a slit of width 0.20 mm. The transmitted…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 108 of the 174 JEE Main shifts held from 2017 to 2026.