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Focal Length of Mirrors and Lenses for JEE: 8 solved questions

Real JEE paper questions on focal length of mirrors and lenses, part of experimental skills. Each opens with the options, the correct answer and a step-by-step solution. Papers run from 2009 to 2026. No sign-in needed to read them.

What this topic asks

• Focal length on the optical bench — 4 questions
• Error in a focal length — 2 questions
• Reading the u-v graphs — 2 questions

All 8 questions with solutions

• In parallax method for the determination of focal length of a concave mirror, the object should always be pla… JEE Main 22nd Jan 2nd Shift 2026
• Five persons P₁, P₂, P₃, P₄ and P₅ recorded object distance (u) and image distance (v) using same convex lens… JEE Main 24th Jan 2nd Shift 2026
• A 2 meter long scale with least count of 0.2 cm is used to measure the locations of objects on an optical ben… JEE Main 6th April 2nd Shift 2023
• In an experiment a convex lens of focal length 15 cm is placed coaxially on an optical bench in front of a co… JEE Main Online 2017
• To find the focal length of a convex mirror, a student records the following data. Object Pin - Convex Lens -… JEE Main Online 2016
• In an optics experiment, with the position of the object fixed, a student varies the position of a convex len… JEE Main 2009
• In an experiment to measure the focal length (f) of a convex lens, the magnitude of object distance (x) and t… JEE Main 30th Jan 2nd Shift 2024
• In an experiment for estimating the value of focal length of converging mirror, image of an object placed at… JEE Main 30th Jan 1st Shift 2023