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Question: Answered & Verified by Expert
The way the fringe pattern changes when the screen is moved away from the slits is 
PhysicsWave OpticsNEET
Options:
  • A width of fringe increases
  • B width of fringe decreases
  • C no changes observed
  • D change will vary
Solution:
1986 Upvotes Verified Answer
The correct answer is: width of fringe increases
Since fringe width   β= λD d

When screen is moved away, D increases. Therefore width of the fringes increases but the angular separation   ( λ/d )  remains the same.

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