Physics 9702 · AS & A Level · The diffraction grating

The diffraction grating — practice question

Light with wavelength $567\,\text{nm}$ falls perpendicularly on a diffraction grating. The grating contains $400$ lines per mm. Several diffraction maxima are seen on the opposite side of the grating. What is the angular separation between the second-order maximum and the third-order maximum?

  • A$13.1^{\circ}$
  • B$13.9^{\circ}$
  • C$15.9^{\circ}$
  • D$27.0^{\circ}$

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