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Question: Answered & Verified by Expert
In Young's double-slit experiment. If the distance between the two slits is equal to the wavelength of used light. Then the maximum number of bright fringes obtained on the screen will be
PhysicsWave OpticsNEET
Options:
  • A Infinite
  • B 3
  • C 7
  • D 5
Solution:
2663 Upvotes Verified Answer
The correct answer is: 3
We know

dsinθ=± m λ

But d=λ

So sinθ=± m

For max.  sinθ=1

m= ± 1

So maximum number of bright fringes = 3

Central maxima + either side of central maxima

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