JEE Main · Physics · Wave Optics

Light Doppler Approximation

JEE Main asked Light Doppler Approximation 2 times in 2 of the 108 shifts Lumi analysed, in 2021 and 2022. It belongs to Doppler Effect, 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: 2021; last in 2022
Pattern: Occasional; across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2021 and 2022. 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: 1 in 24 shifts · 2022: 1 in 24 shifts · 2023: 0 in 12 shifts · 2024: 0 in 18 shifts · 2025: 0 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
20250 of 8
20240 of 18
20230 of 12
20221 of 24
20211 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.

Velocity from doppler shift of light
Wavelength shift from recession speed

Difficulty

Easy 2Medium 0Hard 0

1 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: 18 Mar 2021, Shift 2, 26 Jun 2022, Shift 2.

Same topic

Other ideas in Doppler Effect

Doppler Effect has 8 ideas JEE Main has asked; 5 of them came up in more than one question.

Moving Reflector Echo3× · 2023
Moving Source Cases3× · 2023
Doppler Beat Frequency Calculation2× · 2022
General Doppler Formula2× · 2021
Effect of Wind Velocityonce · 2022
Moving Observer Casesonce · 2022
Exact Relativistic Doppler Formulaonce · 2017

Topic analysis Chapter analysis Study this chapter All repeated ideas