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Question: Answered & Verified by Expert
In the double slit experiment, 5th dark fringe is formed opposite to one of the slits. The wavelength of light is 
PhysicsWave OpticsJEE Main
Options:
  • A d26D
  • B d25D
  • C d215D
  • D d29D
Solution:
1153 Upvotes Verified Answer
The correct answer is: d29D
For dark fringe,

YdD=2m-1λ2




Here, m=5, Y=d2

d2dD=2×5-1λ2

Or d2D=9λ

λ=d29D

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