JEE Main 2017PhysicsWave OpticsMediumMCQ

JEE Main 2017 — Wave Optics Question with Solution

JEE Main 2017 (09 Apr Online)

Question

A single slit of width 0.1 mm is illuminated by a parallel beam of light of wavelength 6000 Å and diffraction bands are observed on a screen 0.5 m from the slit. The distance of the third dark band from the central bright band is:

Choose an option

Show full solutionCorrect option: A
Correct answer
A9 mm

Step-by-step explanation

a=0.1 mm=10-4 m

λ=6000×10-10=6×10-7 m

D=0.5 m

For 3rd  dark

asin⁡θ=3λ

sin⁡θ=3λa=xD

x=3λDa

=3×6×10-7×0.510-4

=9 mm

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About this question

This is a previous-year question from JEE Main 2017, 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.