Physics 9702 · AS & A Level · The diffraction grating

The diffraction grating — practice question

A beam of laser light is incident normally on a diffraction grating. The diagram shows only the second-order maxima that are formed. The grating has a line spacing of $1.0 \times 10^{-6}\,\text{m}$. The angle between the two second-order maxima is $110^{\circ}$. Determine the wavelength of the light.

  • A$4.1 \times 10^{-7}\,\text{m}$
  • B$4.7 \times 10^{-7}\,\text{m}$
  • C$8.2 \times 10^{-7}\,\text{m}$
  • D$9.4 \times 10^{-7}\,\text{m}$

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