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Homework Help: Fresnel diffraction

  1. Nov 6, 2009 #1
    1. The problem statement, all variables and given/known data

    The sun is 45 [deg] above the horizon.
    A wall, 10 [m] height is penpandicular to the line sun-earth. Compute the luminous flux, under the following conditions:
    1. The geometric shadow, while the sun angular dimension is 0.5 [deg].
    2. Fernsel diffraction- the sun as a point source.(lambda=500[nanom])

    2. Relevant equations

    Fresnel integrals

    3. The attempt at a solution
    I did question 1, under the estimtions of the sun distance>>the geometric shadow, and got a nice pattern when the flux is zero until the first ray can reach the floor, gets higher until a full sun flux can reach the ground.
    I'm not sure how to relate the second question. If the ray is passing right near the wall- the flux must be zero- since fernsel integrals are equal to 0.5 on infinity (we relate the point nearest the wall as the infinity, and the infinite distance as the zero ). how can I compute the pattern?
    Thanks alot.
  2. jcsd
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