Physics 9702 · AS & A Level · Interference

Interference — practice question

A laser emits light with wavelength $650\,\text{nm}$. This beam is incident normally on two slits separated by $0.12\,\text{mm}$. A screen is set up parallel to the slits. The bright interference fringes on the screen are spaced $7.5\,\text{cm}$ apart. Determine the distance from the screen to the two slits.

  • A$1.4\,\text{m}$
  • B$2.8\,\text{m}$
  • C$7.0\,\text{m}$
  • D$14\,\text{m}$

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