JEE Main Physics · Ray Optics and Optical Instruments

Lens Maker's Formula in JEE Main

Name: Lens Maker's Formula: JEE Main previous year questions
Creator: Lumi

Lens Maker's Formula (Physics, Ray Optics and Optical Instruments) came 24 times in 21 of the 42 JEE Main shifts Lumi analysed, across 11 distinct ideas. 17 of them came in 2024–26; it was last asked in 2026.

Questions: 24; in 21 shifts
Ideas asked: 11; 5 asked more than once
Numerical answer: 6; 25% of its questions
Pattern: Asked most years; last asked 2026

Questions each year

In the shifts Lumi analysed for each year.

Difficulty and format

Easy 10Medium 12Hard 2

Format

Single correct16 Q
Numerical value6 Q
Diagram based1 Q
Two statements1 Q

Ideas inside the topic

11 ideas

Lens Maker's Equation5 Q
Lens Immersed in a Liquid5 Q
Lenses in Contact3 Q
Lenses Separated by a Distance3 Q
Plano-Convex Lens Focal Length2 Q
Afocal Lens System1 Q
Cutting a Thin Lens1 Q
v versus u Graph1 Q
Longitudinal Magnification1 Q
Silvering of Lens Surface1 Q
Thin Lens Formula1 Q

Where it sits

Part of Ray Optics and Optical Instruments, which had 66 questions in all. Lens Maker's Formula accounts for 36% of them. In Lumi's JEE taxonomy it belongs to Optics.

Every question

All 24 Lens Maker's Formula 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
5 Apr 2026, Shift 2 · Q40A thin convex lens and a thin concave lens are kept in contact and are co-axial. Which of the following statements is correct for this…EasySingle correct
5 Apr 2026, Shift 2 · Q41An object $AB$ is placed 15 cm on the left of a convex lens $P$ of focal length 10 cm. Another convex lens $Q$ is now placed 15 cm right…MediumSingle correct
8 Apr 2026, Shift 2 · Q30A thin biconvex lens is prepared from the glass ( $\mu = 1.5$ ) both curved surfaces of which have equal radii of 20 cm each. Left side…MediumSingle correct
2 Apr 2025, Shift 1 · Q41A slanted object AB is placed on one side of convex lens as shown in the diagram. The image is formed on the opposite side. Angle made by…HardDiagram basedHas a figure
2 Apr 2025, Shift 2 · Q37A bi-convex lens has radius of curvature of both the surfaces same as $1/6$ 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
7 Apr 2025, Shift 1 · Q27Two thin convex lenses of focal lengths 30 cm and 10 cm are placed coaxially, 10 cm apart. The power of this combination is:EasySingle correct
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
8 Apr 2025, Shift 2 · Q43A convex lens of focal length 30 cm is placed in contact with a concave lens of focal length 20 cm. An object is placed at 20 cm to the…MediumSingle 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
9 Apr 2024, Shift 1 · Q45Given below are two statements : Statement (I) : When an object is placed at the centre of curvature of a concave lens, image is formed at…MediumTwo statements
9 Apr 2024, Shift 2 · Q46The following figure represents two biconvex lenses $L_1$ and $L_2$ having focal length $10$ cm and $15$ cm respectively. The distance…MediumSingle correctHas a figure
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
30 Jan 2024, Shift 2 · Q59In an experiment to measure the focal length ( $f$ ) of a convex lens, the magnitude of object distance ( $x$ ) and the image distance ( $y$ )…MediumNumerical valueHas a figure
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
13 Apr 2023, Shift 2 · Q59A bi convex lens of focal length 10 cm is cut in two identical parts along a plane perpendicular to the principal axis. The power of each…EasyNumerical value
24 Jun 2022, Shift 1 · Q52Two identical thin biconvex lenses of focal length 15 cm and refractive index 1.5 are in contact with each other. The space between the…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
8 Jan 2020, Shift 1 · Q25A point object in air is in front of the curved surface of a plano-convex lens. The radius of curvature of the curved surface is 30 cm and…EasyNumerical value
6 Sep 2020, Shift 2 · Q17A double convex lens has power P and same radii of curvature R of both the surfaces. The radius of curvature of a surface of a…MediumSingle correct
2 Apr 2017 (offline) · Q22A diverging lens with magnitude of focal length 25 cm is placed at a distance of 15 cm from a converging lens of magnitude of focal length…MediumSingle correct