JEE Main 2021PhysicsRay OpticsEasyMCQ

JEE Main 2021 — Ray Optics Question with Solution

JEE Main 2021 (26 Aug Shift 1)

Question

Car B overtakes another car A at a relative speed of 40 m s-1. How fast will the image of car B appear to move in the mirror of focal length 10 cm fitted in car A, when the car B is 1.9 m away from the car A?

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Show full solutionCorrect option: A
Correct answer
A0.1 m s-1

Step-by-step explanation

Object distance, u=−1.9 m=190 cm

Focal length, f=10 cm

Magnification, m=ff−u=1010−(−190)

Therefore, m=10200=120

Image velocity, VI=−m2V0=−1202×40

Hence, VI=−0.1 m s-1

Magnitude of velocity =0.1 m s-1

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About this question

This is a previous-year question from JEE Main 2021, 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.