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Basic Diffraction Problem

  1. Apr 26, 2010 #1
    1. The problem statement, all variables and given/known data

    The diffraction pattern shown in the figure is produced by passing He-Ne laser light (λ = 632.8 nm) through a single slit and viewing the pattern on a screen 1.58 m behind the slit.

    What is the slit width?


    2. Relevant equations

    a = {(wavelength)D}/(distance of minima)

    3. The attempt at a solution

    a = {(632.8 x 10^-9)(1.58)}/(.152)

    Answer: slit width = 6.577 x 10^-6 which is very wrong.

    I feel like my equation is definitely wrong.
  2. jcsd
  3. Apr 26, 2010 #2

    Doc Al

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    Staff: Mentor

    Last edited by a moderator: Apr 25, 2017
  4. Apr 26, 2010 #3
    So by dividing by .076 instead of .152 I get 1.316 x 10^-5 which is incorrect. I must be misunderstanding you, sorry.
  5. Apr 26, 2010 #4

    Doc Al

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    Staff: Mentor

    0.076 would be the distance from the center to which minima?
  6. Apr 26, 2010 #5
    Ahhh, got it. Thanks a bunch ;)
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