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Question 20248
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Electromagnetic Waves and Wave Optics: YDSE Fringe Width Change MCQ

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YDSE Fringe Width ChangeEasyQuestion 20248

Question

In YDSE, if slit separation is halved and screen distance is doubled, fringe width:
  1. A
    Doubles
  2. B
    Quadruples
    Correct
  3. C
    Halves
  4. D
    Stays the same

Correct answer

Quadruples

Explanation

β = λD/d. New β = λ(2D)/(d/2) = 4λD/d = 4β. Fringe width quadruples.

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