JEE Main · Physics · Wave Optics

Diffraction Envelope in YDSE

JEE Main asked Diffraction Envelope in YDSE 2 times in 2 of the 108 shifts Lumi analysed, in 2024 and 2025. It belongs to Single Slit Diffraction, in Wave Optics (Physics). The longest wait between two years asking it was 1 year.

Updated 2026-10-24

Times asked: 2; in 2 shifts
Years: 2 of 8
First asked: 2024; last in 2025
Pattern: New since 2024; across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2024 and 2025. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Physics questions.

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 0 in 24 shifts · 2022: 0 in 24 shifts · 2023: 0 in 12 shifts · 2024: 1 in 18 shifts · 2025: 1 in 8 shifts · 2026: 0 in 9 shifts.

Shift by shift

Each square is one analysed shift, in date order. Open a filled one for that paper.

20260 of 9
20251 of 8
20241 of 18
20230 of 12
20220 of 24
20210 of 24
20200 of 12
20170 of 1

Asked in that shift More than once Not asked

How JEE Main framed it

Numerical value is the usual form. Skill tested: calculation.

Slit width from fringes in central maximum
Fringes within single-slit central maximum

Difficulty

Easy 0Medium 2Hard 0

2 of the 2 questions had a numerical answer.

Every question

All 2 questions

From the official JEE Main shift papers, newest first. Open one for the full question, the options and the official answer.

Shifts: 8 Apr 2024, Shift 2, 4 Apr 2025, Shift 2.

Same topic

Other ideas in Single Slit Diffraction

Single Slit Diffraction has 9 ideas JEE Main has asked; 4 of them came up in more than one question.

Topic analysis Chapter analysis Study this chapter All repeated ideas