JEE Main 2020PhysicsWave OpticsMediumMCQ

JEE Main 2020 — Wave Optics Question with Solution

JEE Main 2020 (07 Jan Shift 1)

Question

Visible light of wavelength 6000×10-8cm falls normally on a single slit and produces a diffraction pattern. It is found that the second diffraction minimum is at 60o from the central maximum. If the first minimum is produced at θ1, then θ1 is close to

Choose an option

Show full solutionCorrect option: C
Correct answer
C25o

Step-by-step explanation

For 2nd minima,
dsin⁡θ=2λ
sin⁡θ=32 , (given)
⇒λd=34  ...(1)
So, for 1st minima
dsinθ=λ
⇒sinθ=λd=34
⇒θ=25.65o
⇒θ≈25o

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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.