JEE Main · Physics · Ray Optics and Optical Instruments
Microscope Tube Length
JEE Main asked Microscope Tube Length 2 times in 2 of the 108 shifts Lumi analysed, in 2020 and 2026. It belongs to Optical Instruments, in Ray Optics and Optical Instruments (Physics). The longest wait between two years asking it was 6 years.
Updated 2026-10-24
- Times asked
- 2
- in 2 shifts
- Years
- 2 of 8
- First asked
- 2020
- last in 2026
- Pattern
- Occasional
- across the analysed shifts
Questions on this idea a shift, by year
2017–2026. Asked in 2020 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: 1 in 12 shifts · 2021: 0 in 24 shifts · 2022: 0 in 24 shifts · 2023: 0 in 12 shifts · 2024: 0 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.
- Change in tube length for same magnification
- Object distance for compound microscope
Difficulty
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.
- 5 Apr 2026, Shift 1 · Q42A compound microscope is designed with two symmetric biconvex lenses. The objective lens is cut vertically, creating two identical…HardSingle correct
- 5 Sep 2020, Shift 1 · Q24A compound microscope consists of an objective lens of focal length 1 cm and an eye piece of focal length 5 cm with a separation of 10 cm.…MediumNumerical value
Shifts: 5 Sep 2020, Shift 1, 5 Apr 2026, 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.
- Compound Microscope Magnification2× · 2021
- Resolving Poweronce · 2026
- Reflecting Telescopesonce · 2023
- Astronomical Telescope Magnificationonce · 2022
- Numerical Aperture and Oil Immersiononce · 2022
- Astigmatism and Cylindrical Lensesonce · 2021
- Hypermetropia Correctiononce · 2021
- Simple Microscope Magnificationonce · 2021
- Visual Angle and Angular Magnificationonce · 2021
- Telescope Tube Lengthonce · 2020