Physics 9702 · AS & A Level · The diffraction grating

The diffraction grating — practice question

A parallel beam of light with wavelength $450\,\text{nm}$ falls normally on a diffraction grating that has $300$ lines $\text{mm}^{-1}$. What is the total number of intensity maxima that are observed?

  • A7
  • B8
  • C14
  • D15

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