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Physics (AS & A Level) · Oct / Nov 2018 · Paper 11 · Question 28

9702Interference

When the light from two lamps falls on a screen, no interference pattern can be obtained. Why is this?

  1. AThe lamps are not point sources.
  2. BThe lamps emit light of different amplitudes.
  3. CThe light from the lamps is not coherent.
  4. DThe light from the lamps is white.

As printed in the paper

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Correct answer: C. The light from the lamps is not coherent.

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