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Saturday, 31 October

JEE Main · Physics · Wave Optics

Resultant Intensity Formula

JEE Main asked Resultant Intensity Formula 13 times in 13 of the 108 shifts Lumi analysed, in 2021, 2022, 2023, 2024 and 2025. It belongs to Young's Double Slit, in Wave Optics (Physics). The longest wait between two years asking it was 1 year. In 2022, 2023, 2024 and 2025 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
13
in 13 shifts
Years
5 of 8
First asked
2021
last in 2025
Pattern
Asked most years
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2021, 2022, 2023, 2024 and 2025. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Physics questions.

00.150.30’170’200.03’210.17’220.14’230.14’240.25’250’26

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 1 in 24 shifts · 2022: 5 in 24 shifts · 2023: 2 in 12 shifts · 2024: 3 in 18 shifts · 2025: 2 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
  • 20252 of 8
  • 20243 of 18
  • 20232 of 12
  • 20225 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

Single correct is the usual form. Skill tested: calculation.

  • Max minus min intensity of two beams
  • Resultant amplitude of two phase-shifted waves

Difficulty

Easy 9Medium 4Hard 0

6 of the 13 questions had a numerical answer.

Every question

All 13 questions

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

  1. 7 Apr 2025, Shift 1 · Q41Two plane polarized light waves combine at a certain point whose electric field components are E1=E0sin⁡ωtE_1 = E_0 \sin\omega t…EasySingle correct
  2. 3 Apr 2025, Shift 1 · Q50Two coherent monochromatic light beams of intensities 4I and 9I are superimposed. The difference between the maximum and minimum…EasyNumerical value
  3. 31 Jan 2024, Shift 1 · Q59Two waves of intensity ratio 1:9 cross each other at a point. The resultant intensities at that point, when (a) Waves are incoherent is…MediumNumerical value
  4. 1 Feb 2024, Shift 2 · Q59In Young's double slit experiment, monochromatic light of wavelength 5000 Å is used. The slits are 1.0 mm apart and screen is placed at…MediumNumerical value
  5. 6 Apr 2024, Shift 2 · Q54Two coherent monochromatic light beams of intensities II and 4I4I are superimposed. The difference between maximum and minimum possible…EasyNumerical value
  6. 13 Apr 2023, Shift 2 · Q46In a Young's double slits experiment, the ratio of amplitude of light coming from slits is 2:1. The ratio of the maximum to minimum…EasySingle correct
  7. 10 Apr 2023, Shift 2 · Q47The ratio of intensities at two points P and Q on the screen in a Young's double slit experiment where phase difference between two waves…EasySingle correct
  8. 25 Jun 2022, Shift 1 · Q43The two light beams having intensities I and 9I interfere to produce a fringe pattern on a screen. The phase difference between the beams…MediumSingle correct
  9. 24 Jun 2022, Shift 2 · Q49Two light beams of intensities in the ratio of 9 : 4 are allowed to interfere. The ratio of the intensity of maxima and minima will be :EasySingle correct
  10. 29 Jul 2022, Shift 1 · Q57Two light beams of intensities 4I and 9I interfere on a screen. The phase difference between these beams on the screen at point A is zero…EasyNumerical value
  11. 27 Jul 2022, Shift 2 · Q46Two coherent sources of light interfere. The intensity ratio of two sources is 1 : 4. For this interference pattern if the value of…MediumSingle correct
  12. 27 Jul 2022, Shift 1 · Q53Two beams of light having intensities I and 4I interfere to produce a fringe pattern on a screen. The phase difference between the two…EasyNumerical value
  13. 27 Aug 2021, Shift 2 · Q18The light waves from two coherent sources have same intensity I1=I2=I0I_1=I_2=I_0. In interference pattern the intensity of light at minima is…EasySingle correct

Shifts: 27 Aug 2021, Shift 2, 24 Jun 2022, Shift 2, 25 Jun 2022, Shift 1, 27 Jul 2022, Shift 2, 27 Jul 2022, Shift 1, 29 Jul 2022, Shift 1, 10 Apr 2023, Shift 2, 13 Apr 2023, Shift 2, 31 Jan 2024, Shift 1, 1 Feb 2024, Shift 2, 6 Apr 2024, Shift 2, 3 Apr 2025, Shift 1, 7 Apr 2025, Shift 1.

Same topic

Other ideas in Young's Double Slit

Young's Double Slit has 16 ideas JEE Main has asked; 8 of them came up in more than one question. The 12 most asked are below.

Topic analysisChapter analysisStudy this chapterAll repeated ideas