JEE Main 2024 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 29 January 2024, Shift 1, Physics Q49

Question 49 of 90 in this shift, Physics question 19 of 30, Section A.

A convex mirror of radius of curvature 30 cm forms an image that is half the size of the object. The object distance is :

(1) $15$ cm
(2) $45$ cm
(3) $-15$ cmOfficial answer
(4) $-45$ cm

Official answer

Option 3

NTA final key.

Chapter: Ray Optics and Optical Instruments
Topic: Spherical Mirrors
Idea tested: Linear Magnification

Same idea in other shifts

Asked 3× in all

2 Apr 2025, Shift 2 · Q36Two identical objects are placed in front of convex mirror and concave mirror having same radii of curvature of 12 cm, at same distance of…MediumSingle correct
26 Feb 2021, Shift 1 · Q16A short straight object of height 100 cm lies before the central axis of a spherical mirror whose focal length has absolute value $|f|=40$ …MediumSingle correct

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.