The paper is devoted to specification of the limits of applicability of the geometrical approach (the quasi-classical WKB method) in describing statistical characteristics of electromagnetic radiation propagating in a planar-layered randomly inhomogeneous medium. It is shown that the geometrical optics method is the limiting case of the modified traveling wave method. Based on the comparison of solutions obtained by these methods for the one-dimensional problem, conditions determining the range of applicability of the geometrical optics approximation are derived.
Department of Physics of Atmosphere and Mathematical Geophysics, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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