Quasi-homogeneous sources and geometrical optics.
It is shown that the quasi-homogeneous model of a partially coherent source predicts the same optical-intensity distribution across the Fresnel and Fraunhofer regions as would be predicted by geometrical optics.
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Istituto di Fisica Facoltd di Ingegneria Universitd di Roma and Gruppo Nazionale di Struttura delta Materia, P. Aldo Moro, 5, Rome, Italy.