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Internal half of the fresnel zone

  1. Feb 21, 2013 #1
    1. The problem statement, all variables and given/known data
    Plane monochromatic light wave with intensity I 0 is incident normally on an opaque screen with a circular hole. What is the light intensity I of the screen at the point for which the hole:
    a) is the first Fresnel zone, the inner half of the first zone,
    b) made ​​equal to the first Fresnel zone, and then shut it down half (diameter)?


    2. Relevant equations

    Here What is the inner half of the first zone??? Is there any outer half for the first zone.

    3. The attempt at a solution
     
  2. jcsd
  3. Feb 22, 2013 #2
    Hint: http://en.wikipedia.org/wiki/Fresnel_zone

    What do you notice from here ?
     
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