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Question 20202
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Electromagnetic Waves and Wave Optics: YDSE Fringe Width MCQ

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YDSE Fringe WidthEasyQuestion 20202

Question

Fringe width β in Young's double-slit experiment (slit separation d, screen distance D, wavelength λ) is:
  1. A
    λD/d
    Correct
  2. B
    λd/D
  3. C
    dD/λ
  4. D
    λD²/d

Correct answer

λD/d

Explanation

β = λD/d. Fringe width increases with larger D (screen farther away) and larger λ (longer wavelength), and decreases with larger d (slits closer together).

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