Physics 9702 · AS & A Level · The diffraction grating

The diffraction grating — practice question

A diffraction grating is employed to determine the wavelength of monochromatic light. The slit spacing in the grating is $1.15 \times 10^{-6}\,\text{m}$. The angle between the first order diffraction maxima is $60.0^\circ$, as illustrated in the diagram. What is the wavelength of the light?

  • A$288\,\text{nm}$
  • B$498\,\text{nm}$
  • C$575\,\text{nm}$
  • D$996\,\text{nm}$

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