Learn

Saturday, 31 October

JEE Main · Physics · Ray Optics and Optical Instruments

Apparent Depth of Immiscible Liquids

JEE Main asked Apparent Depth of Immiscible Liquids 4 times in 4 of the 108 shifts Lumi analysed, in 2020, 2023, 2024 and 2025. It belongs to Refraction and Snell's Law, in Ray Optics and Optical Instruments (Physics). The longest wait between two years asking it was 3 years.

Updated 2026-10-24

Times asked
4
in 4 shifts
Years
4 of 8
First asked
2020
last in 2025
Pattern
Comes in cycles
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2020, 2023, 2024 and 2025. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Physics questions.

00.10.20’170.08’200’210’220.07’230.05’240.13’250’26

Raw count: 2017: 0 in 1 shift · 2020: 1 in 12 shifts · 2021: 0 in 24 shifts · 2022: 0 in 24 shifts · 2023: 1 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
  • 20231 of 12
  • 20220 of 24
  • 20210 of 24
  • 20201 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.

  • Height of liquid from apparent shift
  • Apparent depth through liquid layers

Difficulty

Easy 3Medium 1Hard 0

2 of the 4 questions had a numerical answer.

Every question

All 4 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 · Q50A container contains a liquid with refractive index of 1.2 up to a height of 60 cm and another liquid having refractive index 1.6 is added…MediumNumerical value
  2. 27 Jan 2024, Shift 1 · Q59Two immiscible liquids of refractive indices 85\frac{8}{5} and 32\frac{3}{2} respectively are put in a beaker as shown in the figure. The…EasyNumerical valueHas a figure
  3. 13 Apr 2023, Shift 1 · Q44A vessel of depth 'd' is half filled with oil of refractive index n1n_1 and the other half is filled with water of refractive index n2n_2.…EasySingle correct
  4. 9 Jan 2020, Shift 1 · Q15A vessel of depth 2h is half filled with a liquid of refractive index 222\sqrt{2} and the upper half with another liquid of refractive…EasySingle correct

Shifts: 9 Jan 2020, Shift 1, 13 Apr 2023, Shift 1, 27 Jan 2024, Shift 1, 7 Apr 2025, Shift 1.

Same topic

Other ideas in Refraction and Snell's Law

Refraction and Snell's Law has 18 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