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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
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.