Abstract

It is shown that certain combinations of reflectances and transmittances of a pair of semireflecting films will produce transmissionlike reflection fringes under phase-angle conditions normally associated with reflection-type fringes. Some of these combinations are precluded by the conservation of energy. The familiar restrictions r2+t2≤1, r2+t2≤1 on the transmittance and forward and backward reflectances of a film must be supplemented by the condition (1+r′)(1−r)≤t2.

© 1963 Optical Society of America

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