alleryIn Young's double slit experiment, if slit separation is halved and wavelength doubled, fringe width becomes:
ASame
B4× original
C2× original
D1/2 original
Answer & Solution
Correct answer: B. 4× original
β = λD/d.
New β = (2λ)D/(d/2) = 4 λD/d = 4 × original.
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