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Physics (AS & A Level) · May / June 2020 · Paper 11 · Question 30

9702The diffraction grating

A diffraction grating and a screen are used to determine the single wavelength λ of the light from a source. What is an essential feature of this experiment?

  1. AA curved screen must be used.
  2. BThe diffraction angle θ must be measured for at least two interference maxima.
  3. CThe light waves incident on the grating must be coherent.
  4. DThe third order intensity maximum must be produced.

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Correct answer: C. The light waves incident on the grating must be coherent.

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