JEE Main 2021PhysicsRay OpticsMediumMCQ

JEE Main 2021 — Ray Optics Question with Solution

JEE Main 2021 (27 Aug Shift 1)

Question

Find the distance of the image from object O, formed by the combination of lenses in the figure:

Choose an option

Show full solutionCorrect option: A
Correct answer
A75 cm

Step-by-step explanation

1 Lens formula

1v-1u=1f,

1v-1-30=110

1v=110-130;  1v=3-130;v=15 cm

2 u=+10

1v-110=1-10

1v=-110+110  v=∞

3 Ray will converge at focus of 30 cm right of third lens.
it.v=+30 cm (from third lens)

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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.