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Diffraction Grating

  1. Jun 3, 2012 #1
    1. The problem statement, all variables and given/known data
    A monochromatic plane wave is normally incident on a diffraction grating with 105 lines/m. For what visible wavelengths would this grating produce a maximum at 11°.

    2. Relevant equations
    d*sinθ = m*λ

    3. The attempt at a solution
    d = 1 x 10-5 m

    I don't get how to actually solve it because i don't know what the m for this situation would be.
  2. jcsd
  3. Jun 3, 2012 #2


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    Hi Swan! :smile:
    (we usually use "n", not "m")

    it can be any whole number …

    there may be more than one value for which there is a solution :wink:
  4. Jun 3, 2012 #3
    Hello tiny-tim. Thank You for replying. How would i go about solving this question?
  5. Jun 3, 2012 #4


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    by using your equation …

    what do you get? :smile:
  6. Jun 3, 2012 #5
    I got at m = 3 and m = 4 the diffraction grating would produce a maximum at 11° at visible wavelengths of 636 nm, 477 nm respectively to m = 3, m = 4.
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