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Single slit diffraction pattern in 2D

  1. Jul 28, 2014 #1
    Hi all,

    I was looking at previous exams and I saw a question with single slit diffraction. Please look at picture.

    So, this made me think: "Wow, I never thought single slit diffraction could be applied in 2D with one pattern horizontal and the other vertical."

    Then, I thought why is there no diffraction patterns along all the surface of the viewing screen. Can anyone explain why? The textbook I am using emphasizes how when a wave enters a boundary place, each point sends out its own spherical wavelet in 3D. So, why don't we see that on the viewing screen?
     

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  2. jcsd
  3. Jul 28, 2014 #2
    Constructive and destructive interference I presume. You can draw it, we did this in first year undergrad.
     
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