JEE Main Physics · Ray Optics and Optical Instruments
Lens Maker's Equation
Lens Maker's Equation (Ray Optics and Optical Instruments) was asked 5 times in 5 JEE Main shifts, 2024–2026, out of the 42 shifts Lumi analysed. 1 of the 5 had a numerical answer.
- Times asked
- 5
- in 5 shifts
- Years
- 2024–2026
- Usual format
- Single correct
- Calculation
- Pattern
- New since 2024
- repeats across shifts
How it is asked
- Refractive index from focal length
- Focal length from lens maker formula
Difficulty
Easy 4Medium 1Hard 0
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.
- 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
- 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 Apr 2025, Shift 2 · Q37A bi-convex lens has radius of curvature of both the surfaces same as cm. If this lens is required to be replaced by another convex…MediumSingle correct
- 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
- 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