I deriving a pupil function in a coherent imaging system

silentt
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Homework Statement
The aperture is opaque with 3 circular holes, each with a diameter of w. The coordinates of the center of the circular apertures are: {0, d/2}, {0, -d/2}, {d/2, 0}.
Derive the coherent transfer function.
Relevant Equations
{0, d/2}, {0, -d/2}, {d/2, 0}
Hello all. I have a question about building the coherent transfer function and specifically how I would go about deriving the pupil function for this figure. I have not come across this in my class yet and am a bit stumped.
Any help would be appreciated.
 

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the pupil would be a circular aperture and 3 2-d delta functions
 
Awesome, thanks for confirming my suspicions.
 

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