Physics 9702 · AS & A Level · The diffraction grating

The diffraction grating — practice question

A parallel beam of white light is directed through a diffraction grating. Orange light with wavelength $600\,\text{nm}$ in the fourth-order diffraction maximum overlaps with blue light in the fifth-order diffraction maximum. What is the wavelength of the blue light?

  • A$450\,\text{nm}$
  • B$480\,\text{nm}$
  • C$500\,\text{nm}$
  • D$750\,\text{nm}$

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