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Question: Answered & Verified by Expert
In Young's double-slit experiment, the path difference between two interfering waves at a point on the screen is 13.5 times the wavelength. The point is
PhysicsWave OpticsNEET
Options:
  • A Bright but not central bright
  • B Neither bright not dark
  • C Central bright
  • D Dark
Solution:
1252 Upvotes Verified Answer
The correct answer is: Dark
Given,

Path difference Δ=13.5λ ......(i)

We know that, for minima

Path difference Δ=n+12λ ......(ii)

We can write Eq. (i) in the following form

Δ=13+12λ ......(iii)

From Eq. (ii) and (iii), it is clear that there will be minima. So, the point will be dark.

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