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On the Criteria of the Applicability of Geometric Optics in Problems of Wave Propagation in Media with Slight Inhomogeneities of the Coefficient of Refraction

Valerʹi︠a︡n Ilʹich Tatarskiĭ

出版	Morris D. Friedman, 1953
URL	http://books.google.com.hk/books?id=PgjR0AEACAAJ&hl=&source=gbs_api

註釋

There is established a criterion of the applicability of geometric options in slightly inhomogeneous media. It is proved that the conditions [Lambda] “ [Iota], {lambda] L “ [Iota]2 guarantee coincidence of the amplitudes and phases of the geometric and wave solutions.