JEE Main 2020PhysicsWave OpticsMediumNumerical

JEE Main 2020 — Wave Optics Question with Solution

JEE Main 2020 (06 Sep Shift 2)

Question

A Young's double-slit experiment is performed using monochromatic light of wavelength λ. The intensity of light at a point on the screen, where the path difference is λ, is K units. The intensity of light at a point where the path difference is λ6 is given by nK12, where n is an integer. The value of n is 

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Show full solutionCorrect answer: 9
Correct answer
9

Step-by-step explanation

I=I0cos2ϕ2

=kcos2πλ×λ6

=k cos2π6

=3k4=9k12

n=9

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About this question

This is a previous-year question from JEE Main 2020, 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.