JEE Main 2019PhysicsWave OpticsEasyMCQ

JEE Main 2019 — Wave Optics Question with Solution

JEE Main 2019 (10 Jan Shift 2)

Question

Consider a Young's double slit experiment as shown in figure. What should be the slit separation d in terms of wavelength λ such that the first minima occurs directly in front of the slit (S1) ?

Choose an option

Show full solutionCorrect option: C
Correct answer
Cλ25-2

Step-by-step explanation



Path diff. in front of a slit on screen

∆=5d-2d=2n-1λ2 

(for minima)

For 1st minima n=1

d5-2=λ2

d=λ25-2

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About this question

This is a previous-year question from JEE Main 2019, 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.