The paper is an extension of an earlier article on the wide-angle interference of multipole radiation. Nonideal reflections are here taken into account and the theory is applied to the Lloyd's mirror arrangement using a material point source composed of electric or magnetic dipoles, quadrupoles, or octopoles. Qualitatively the earlier results are not appreciably altered; quantitatively it is found that the ideal treatment gives satisfactory results for nonideal metallic mirrors only for divergent beams making an angle greater than about 90^∘{}.
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F. W. Doermann (1938) studied this question.
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