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Physics (AS & A Level) · May / June 2019 · Paper 13 · Question 30

9702The diffraction grating

Monochromatic light of wavelength 690 nm passes through a diffraction grating with 300 lines per mm, producing a series of maxima (bright spots) on a screen. What is the greatest number of maxima that can be observed?

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

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Correct answer: D. 9

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