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Question: Answered & Verified by Expert
In Young's double-slit experiment, if yellow light is replaced by blue light, the interference fringes become
PhysicsWave OpticsNEET
Options:
  • A Darker
  • B Brighter
  • C Wider
  • D Narrower
Solution:
1503 Upvotes Verified Answer
The correct answer is: Narrower
The wavelength λ of yellow light is greater than blue light.

We know that,

Fringe width w=Dλd

wλ

Here, λ  decreases. Hence, the interference fringes become narrower.

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