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Saturday, 31 October

JEE Main · Physics · Ray Optics and Optical Instruments

Compound Microscope Magnification

JEE Main asked Compound Microscope Magnification 2 times in 2 of the 108 shifts Lumi analysed, in 2020 and 2021. It belongs to Optical Instruments, in Ray Optics and Optical Instruments (Physics). The longest wait between two years asking it was 1 year.

Updated 2026-10-24

Times asked
2
in 2 shifts
Years
2 of 8
First asked
2020
last in 2021
Pattern
Gone quiet
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2020 and 2021. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Physics questions.

00.050.10’170.08’200.03’210’220’230’240’250’26

Raw count: 2017: 0 in 1 shift · 2020: 1 in 12 shifts · 2021: 1 in 24 shifts · 2022: 0 in 24 shifts · 2023: 0 in 12 shifts · 2024: 0 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
  • 20240 of 18
  • 20230 of 12
  • 20220 of 24
  • 20211 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.

  • Objective magnification from compound microscope magnification
  • Eyepiece focal length of microscope

Difficulty

Easy 0Medium 1Hard 1

1 of the 2 questions had a numerical answer.

Every question

All 2 questions

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

  1. 3 Aug 2021, Shift 1 · Q17A compound microscope has a magnification of 30. Assuming that the final image is formed at the least distance of distinct vision (25…MediumSingle correct
  2. 4 Sep 2020, Shift 1 · Q24In a compound microscope, the magnified virtual image is formed at a distance of 25 cm from the eye-piece. The focal length of its…HardNumerical value

Shifts: 4 Sep 2020, Shift 1, 3 Aug 2021, Shift 1.

Same topic

Other ideas in Optical Instruments

Optical Instruments has 11 ideas JEE Main has asked; 2 of them came up in more than one question.

Topic analysisChapter analysisStudy this chapterAll repeated ideas