Physics 9702 · AS & A Level · The diffraction grating

The diffraction grating — practice question

A parallel beam of red light with wavelength $700\,\text{nm}$ falls perpendicularly on a diffraction grating with 400 lines per millimetre. What is the total number of intensity maxima produced by the grating?

  • A6
  • B7
  • C8
  • D9

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