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Physics (AS & A Level) · Oct / Nov 2022 · Paper 13 · Question 28

9702Interference

A light source consists of a vertical slit illuminated by red light (R) and violet light (V). The wavelength of R is approximately twice the wavelength of V. A parallel vertical double slit is placed nearby. A white screen is placed so that fringes are formed on it. Which graph best represents the interference fringes formed on the screen?

  1. AGraph A
  2. BGraph B
  3. CGraph C
  4. DGraph D

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Correct answer: C. Graph C

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