Abstract

The diffraction image formed by an Airy-type objective when the object is a circular, uniformly self-radiant disk is found to exhibit the phenomenon of a secondary Airy disk when the radius of the object is near 1.2 Airy units. The time-averaged irradiance in the diffraction image is presented for radii up to 4 Airy units. A separate expression for the irradiance at the geometrical radius in the image shows that as the object becomes very large the value of this irradiance approaches one-half that at the center of the image.

© 1961 Optical Society of America

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Equations (18)

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