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Physics (AS & A Level) · Oct / Nov 2025 · Paper 13 · Question 30

9702The diffraction grating

Green laser light passes through a diffraction grating and forms an interference pattern. The diffraction grating contains 400 lines per mm. The wavelength of the laser light is 550 nm. What is the highest order diffraction maximum produced by the grating?

  1. A4
  2. B5
  3. C8
  4. D9

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Correct answer: A. 4

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