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Physics (AS & A Level) · May / June 2018 · Paper 11 · Question 25

9702Interference

A teacher sets up the apparatus shown to demonstrate a double-slit interference pattern on the screen. Which change to the apparatus will increase the fringe spacing?

  1. Adecreasing the distance p
  2. Bdecreasing the distance q
  3. Cdecreasing the distance r
  4. Ddecreasing the wavelength of the light

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Correct answer: B. decreasing the distance q

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