Physics 9702 · AS & A Level · Interference

Interference — practice question

Monochromatic light of one wavelength is directed normally at two slits separated by $0.20\,\text{mm}$. Interference fringes are seen on a screen positioned $5.4\,\text{m}$ from the slits. The separation of adjacent bright fringes is $12\,\text{mm}$. What is the wavelength of the light?

  • A$440\,\text{nm}$
  • B$540\,\text{nm}$
  • C$650\,\text{nm}$
  • D$900\,\text{nm}$

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