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PRACTICE · MEMBERSIntermediate · Single correct

PRACTICE / Diffraction gratings

A flat screen needs tangent geometry

A grating with 1000 lines/mm is illuminated normally by 600 nm light. A flat screen parallel to the grating lies 2.0 m away.

How far from the central maximum is the first-order maximum on the screen?

Organize the givens & assumptions
  • Line density = 1000/mm
  • λ = 600 nm
  • Screen distance L = 2.0 m

Ideal far-field diffraction, normal incidence on a regular transmission grating, equal coherent illumination over the stated width, and vacuum wavelengths in air. Resolution uses the stated ideal Rayleigh criterion; aberrations and detector limitations are neglected.

  1. A1.20 m1.20\ \mathrm m
  2. B0.60 m0.60\ \mathrm m
  3. C2.00 m2.00\ \mathrm m
  4. D1.50 m1.50\ \mathrm m

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