The diffraction patterns of the central aperture and the first 10 rings of the classical Fresnel zone plate are calculated in the principal focal plane for off-axis distances as large as the radius of the 10th ring. The zone-plate pattern is found by summation; near the axis it is compared with closed-form approximations. The integrated flux within circles as large as the 10th ring is also calculated.
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Murk J. Bottema (1969) studied this question.
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