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Physics (AS & A Level) · Oct / Nov 2020 · Paper 11 · Question 29

9702The diffraction grating

A parallel beam of white light passes through a diffraction grating. Orange light of wavelength 600 nm in the fourth-order diffraction maximum coincides with blue light in the fifth-order diffraction maximum. What is the wavelength of the blue light?

  1. A450 nm
  2. B480 nm
  3. C500 nm
  4. D750 nm

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Correct answer: B. 480 nm

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