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Electromagnetic Waves and Wave Optics: Destructive Interference Condition MCQ

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Destructive Interference ConditionEasyQuestion 20204

Question

Destructive interference occurs when path difference Δ equals:
  1. A
    nλ
  2. B
    (2n+1)λ/2 where n = 0, 1, 2...
    Correct
  3. C
    nλ/2
  4. D
    2nλ

Correct answer

(2n+1)λ/2 where n = 0, 1, 2...

Explanation

When path difference = (2n+1)λ/2 = odd multiple of λ/2, crest meets trough → destructive interference → dark fringe. Phase difference = (2n+1)π.

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