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Physics (AS & A Level) · Feb / March 2025 · Paper 12 · Question 27

9702Interference

Light waves are emitted from two sources. What is a necessary condition for observable interference fringes to be produced?

  1. AThe waves must be polarised.
  2. BThe waves must not be polarised.
  3. CThe waves must be coherent.
  4. DThe waves must have equal amplitudes.

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Correct answer: C. The waves must be coherent.

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