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Saturday, 31 October

JEE Main · Physics · Ray Optics and Optical Instruments

Lens Magnification

JEE Main asked Lens Magnification 3 times in 3 of the 108 shifts Lumi analysed, in 2021 and 2024. It belongs to Lens Maker's Formula, in Ray Optics and Optical Instruments (Physics). The longest wait between two years asking it was 3 years. In 2024 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
3
in 3 shifts
Years
2 of 8
First asked
2021
last in 2024
Pattern
Occasional
across the analysed shifts

Questions on this idea a shift, by year

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

00.050.10’170’200.03’210’220’230.09’240’250’26

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 1 in 24 shifts · 2022: 0 in 24 shifts · 2023: 0 in 12 shifts · 2024: 2 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
  • 20242 of 18
  • 20230 of 12
  • 20220 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.

  • Focal length from magnification and separation
  • Focal length from magnification and object-image distance

Difficulty

Easy 1Medium 2Hard 0

3 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.

  1. 30 Jan 2024, Shift 1 · Q59The distance between object and its two times magnified real image as produced by a convex lens is 45 cm. The focal length of the lens…EasyNumerical value
  2. 1 Feb 2024, Shift 1 · Q59The distance between object and its 3 times magnified virtual image as produced by a convex lens is 20 cm. The focal length of the lens…MediumNumerical value
  3. 25 Feb 2021, Shift 1 · Q28The same size images are formed by a convex lens when the object is placed at 20 cm or at 10 cm from the lens. The focal length of convex…MediumNumerical value

Shifts: 25 Feb 2021, Shift 1, 30 Jan 2024, Shift 1, 1 Feb 2024, Shift 1.

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