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5. Derive an expression for the Fraunhofer diffraction pattern (Four transform) for an aperture
made of M =2L+1 parallel slits of infinitesimal widths separated by equal distances a= 10A,
p(x, y) = 8(x-ma)
m=-L
Sketch the pattern as a function of the observation angle 0 = x/d, where is the d is the
observation distance.

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