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In Young's experiment, fringe width β equals:

AλD/d
Bλd/D
CDd/λ
Dλ/(Dd)
Answer & Solution
Correct answer: A. λD/d
Fringe width β = λD/d, where λ is wavelength, D is slit-to-screen distance, d is slit separation. Wider screen distance or longer wavelength give wider fringes.
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