JEE Main 2024PhysicsRay OpticsMediumNumerical

JEE Main 2024 — Ray Optics Question with Solution

JEE Main 2024 (30 Jan Shift 1)

Question

The distance between object and its two times magnified real image as produced by a convex lens is 45 cm. The focal length of the lens used is ________cm.

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Show full solutionCorrect answer: 10
Correct answer
10

Step-by-step explanation

Magnification, m=vu=-2

⇒v=-2u    …i

As,

v-u=45    …ii

⇒u=-15 cm

Then, v=30 cm

From lens equation, we can write

1f=1v-1u⇒1f=130-1-15

⇒f=+10 cm

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About this question

This is a previous-year question from JEE Main 2024, covering the Ray Optics chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.