JEE Main · Physics · Wave Optics
Fringe Shift by Thin Slab
JEE Main asked Fringe Shift by Thin Slab 3 times in 3 of the 108 shifts Lumi analysed, in 2022, 2024 and 2026. It belongs to Young's Double Slit, in Wave Optics (Physics). The longest wait between two years asking it was 2 years.
Updated 2026-10-24
- Times asked
- 3
- in 3 shifts
- Years
- 3 of 8
- First asked
- 2022
- last in 2026
- Pattern
- Frequent
- across the analysed shifts
Questions on this idea a shift, by year
2017–2026. Asked in 2022, 2024 and 2026. 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: 1 in 24 shifts · 2023: 0 in 12 shifts · 2024: 1 in 18 shifts · 2025: 0 in 8 shifts · 2026: 1 in 9 shifts.
Shift by shift
Each square is one analysed shift, in date order. Open a filled one for that paper.
How JEE Main framed it
Numerical value is the usual form. Skill tested: calculation.
- Slab thickness from fringe shift
- Glass slab condition for unchanged central intensity
Difficulty
2 of the 3 questions had a numerical answer.
Every question
All 3 questions
From the official JEE Main shift papers, newest first. Open one for the full question, the options and the official answer.
- 4 Apr 2026, Shift 2 · Q50In a double slit experiment, when one of the slits is covered by a transparent mica sheet of refractive index 1.56, the central fringe…MediumNumerical value
- 9 Apr 2024, Shift 2 · Q52Monochromatic light of wavelength nm is used in Young's double slit experiment. An interference pattern is obtained on a screen.…MediumNumerical value
- 28 Jun 2022, Shift 2 · Q46In young’s double slit experiment performed using a monochromatic light of wavelength , when a glass plate (=1.5) of…MediumSingle correct
Shifts: 28 Jun 2022, Shift 2, 9 Apr 2024, Shift 2, 4 Apr 2026, Shift 2.
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.
- YDSE Fringe Width14× · 2024
- Resultant Intensity Formula13× · 2025
- Intensity at Fractional Path Differences6× · 2026
- Intensity Ratio from Slit Widths6× · 2025
- Effect of Medium on Fringes2× · 2026
- Coinciding Maxima of Two Wavelengths2× · 2024
- Angular Fringe Width2× · 2022
- Intensity Exactly Opposite a Slitonce · 2026
- White Light Interferenceonce · 2025
- Exact Path Difference without Approximationonce · 2024
- Position of nth Maximum and Minimumonce · 2022
- Fringe Visibility and Contrastonce · 2021