JEE Main 2021PhysicsWave OpticsMediumMCQ

JEE Main 2021 — Wave Optics Question with Solution

JEE Main 2021 (24 Feb Shift 1)

Question

In a Young's double slit experiment, the width of the one of the slit is three times the other slit. The amplitude of the light coming from a slit is proportional to the slit-width. Find the ratio of the maximum to the minimum intensity in the interference pattern.

Choose an option

Show full solutionCorrect option: D
Correct answer
D4:1

Step-by-step explanation

⇒A2=3 A1

ImaxImin=I1+I2I1-I22

∵ Intensity I∝A2

⇒ImaxImin=A1+A2A1−A22

=A1+3A1A1−3A12

=4A12A12=4:1

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About this question

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