Physics 9702 · AS & A Level · Interference

Interference — practice question

A screen $1.00\,\text{m}$ from a double slit shows fringes with spacing $x$ when the slits are illuminated by yellow light of wavelength $600\,\text{nm}$. At what distance from the slits should the screen be placed so that blue light of wavelength $400\,\text{nm}$ produces fringes with the same spacing $x$?

  • A$0.33\,\text{m}$
  • B$0.67\,\text{m}$
  • C$0.75\,\text{m}$
  • D$1.50\,\text{m}$

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