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Physics (AS & A Level) · May / June 2017 · Paper 12 · Question 28

9702The diffraction grating

A parallel beam of red light of wavelength 700 nm is incident normally on a diffraction grating that has 400 lines per millimetre. What is the total number of intensity maxima from the grating?

  1. A6
  2. B7
  3. C8
  4. D9

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Correct answer: B. 7

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