A diffraction grating produces sharp bright lines because of:

  1. diffraction combined with interference from many slits
  2. reflection only
  3. the Doppler effect
  4. polarization
Answer

A) diffraction combined with interference from many slits

Many coherent sources. SLO P-11-D-13 · Understanding

Physics MCQ · More Superposition, Stationary Waves and Beats MCQs · Practise