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Saturday, 31 October

JEE Main · Physics · Ray Optics and Optical Instruments

Lens Maker's Equation

JEE Main asked Lens Maker's Equation 5 times in 5 of the 108 shifts Lumi analysed, in 2024, 2025 and 2026. It belongs to Lens Maker's Formula, in Ray Optics and Optical Instruments (Physics). The longest wait between two years asking it was 1 year. In 2025 and 2026 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
5
in 5 shifts
Years
3 of 8
First asked
2024
last in 2026
Pattern
New since 2024
across the analysed shifts

Questions on this idea a shift, by year

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

00.150.30’170’200’210’220’230.05’240.25’250.22’26

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: 2 in 8 shifts · 2026: 2 in 9 shifts.

Shift by shift

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

  • 20262 of 9
  • 20252 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

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

  • Refractive index from focal length
  • Focal length from lens maker formula

Difficulty

Easy 4Medium 1Hard 0

1 of the 5 questions had a numerical answer.

Every question

All 5 questions

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

  1. 4 Apr 2026, Shift 2 · Q41A convex lens is made from glass material having refractive index of 1.4 with same radius of curvature on both sides. The ratio of its…EasySingle correct
  2. 2 Apr 2026, Shift 2 · Q49If sunlight is focused on a paper using convex lens, it starts burning the paper in shortest time when the lens is kept at 30 cm above the…EasyNumerical value
  3. 3 Apr 2025, Shift 1 · Q42The radii of curvature for a thin convex lens are 10 cm and 15 cm respectively. The focal length of the lens is 12 cm. The refractive…EasySingle correct
  4. 2 Apr 2025, Shift 2 · Q37A bi-convex lens has radius of curvature of both the surfaces same as 1/61/6 cm. If this lens is required to be replaced by another convex…MediumSingle correct
  5. 6 Apr 2024, Shift 2 · Q46For the thin convex lens, the radii of curvature are at 15 cm and 30 cm respectively. The focal length the lens is 20 cm. The refractive…EasySingle correct

Shifts: 6 Apr 2024, Shift 2, 2 Apr 2025, Shift 2, 3 Apr 2025, Shift 1, 2 Apr 2026, Shift 2, 4 Apr 2026, Shift 2.

Same topic

Other ideas in Lens Maker's Formula

Lens Maker's Formula has 16 ideas JEE Main has asked; 9 of them came up in more than one question. The 12 most asked are below.

Topic analysisChapter analysisStudy this chapterAll repeated ideas