JEE Main 2019 — Wave Optics Question with Solution
From: JEE Main 2019 (Online) 9th January Evening Slot
Question
In a Young's double slit experiment, the slits are placed 0.320 mm apart. Light of wavelength = 500 nm is incident on the slits. The total number of bright fringes that are observed in the angular range 30o30o is :
Choose an option
Show full solutionCorrect option: D
Correct answer
D641
Step-by-step explanation
We know, path difference,
d sin = n
here n = no of bright fringer in the angle
here given
d = 0.32 10-3 m
= 500 109 m
0.32 103 sin30o = n 500 109
n = 320
Total number of maxima in the range
30o 30o is = 320 2 + 1 = 641
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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.