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In Young's experiment, a BRIGHT fringe (constructive interference) requires path difference = ?
A$(n + 0.5)\lambda$, n = 0, 1, 2, …
BAlways $0$, regardless of n
CHalf wavelength $\lambda/2$ only
D$n\lambda$, n = 0, 1, 2, …
Answer & Solution
Correct answer: D. $n\lambda$, n = 0, 1, 2, …
Constructive interference (bright) requires path difference = nλ (n = 0, ±1, ±2, ...) so waves arrive in phase. Destructive (dark) needs (n + ½)λ.
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