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In Young's double-slit experiment, the bright fringe condition is path difference equals:

Anλ (integer multiple of wavelength)
B(n + 1/2)λ
Cnλ/2
DZero only
Answer & Solution
Correct answer: A. nλ (integer multiple of wavelength)
Constructive interference (bright fringe): path difference = nλ for n = 0, 1, 2, ... **Destructive interference (dark fringe):** path difference = (n + 1/2)λ.
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