JEE Main Physics · Ray Optics and Optical Instruments
Lens Immersed in a Liquid
Lens Immersed in a Liquid (Ray Optics and Optical Instruments) was asked 5 times in 5 JEE Main shifts, 2021–2025, out of the 42 shifts Lumi analysed. 1 of the 5 had a numerical answer.
- Times asked
- 5
- in 5 shifts
- Years
- 2021–2025
- Usual format
- Single correct
- Calculation
- Pattern
- Comes in cycles
- repeats across shifts
How it is asked
- Focal length of lens in liquid
- Focal length of lens with liquid filled surface
Difficulty
Easy 2Medium 2Hard 1
Where it sits
Chapter: Ray Optics and Optical Instruments. Topic: Lens Maker's Formula, 24 questions over 11 ideas.
Other repeat ideas in this topic
Every time it came
All 5 questions
Newest first, each with its options and official answer.
- 7 Apr 2025, Shift 1 · Q42A lens having refractive index 1.6 has focal length of 12 cm, when it is in air. Find the focal length of the lens when it is placed in…EasySingle correct
- 8 Apr 2025, Shift 2 · Q41A concave-convex lens of refractive index 1.5 and the radii of curvature of its surfaces are 30 cm and 20 cm, respectively. The concave…HardSingle correct
- 29 Jan 2024, Shift 1 · Q45A biconvex lens of refractive index 1.5 has a focal length of 20 cm in air. Its focal length when immersed in a liquid of refractive index…MediumSingle correct
- 11 Apr 2023, Shift 1 · Q52The radius of curvature of each surface of a convex lens having refractive index 1.8 is 20 cm. The lens is now immersed in a liquid of…MediumNumerical value
- 16 Mar 2021, Shift 2 · Q3The refractive index of a converging lens is 1.4. What will be the focal length of this lens if it is placed in a medium of same…EasySingle correct