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Physics (AS & A Level) · May / June 2018 · Paper 12 · Question 29

9702Interference

A two-source interference experiment uses the apparatus shown. What is the main purpose of the single slit?

  1. Ato make a narrow beam of light
  2. Bto make the same amplitude of light incident on each slit
  3. Cto provide coherent light
  4. Dto provide monochromatic light

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Correct answer: C. to provide coherent light

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