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Rayleigh and Rayleigh-Gans-Stevenson approximationsThe main ideas of all the approximate methods are related to certain regions of the values of the basic diffraction parameters - the size parameter![]() ![]() ![]() ![]() The accuracy of the Rayleigh approximation for spheres was most carefully investigated in [303]. Because of its simplicity this approximation was utilized in a huge number of works to estimate the influence of the optical, geometrical and morphological parameters of particles on their scattering and extinction characteristics [7,11,25,124]. Typical examples are the papers on estimates of the extinction spectra of disperse systems of small particles [161,205,207,208,231,273,427,431]. The Rayleigh approximation is one of the main approaches in the theory of light scattering by gases, liquids and solutions in the regions distant from the critical points [18,26,130]. It should be noted that in the literature the terms including the name of Rayleigh (Rayleigh scattering, Rayleigh line, etc.) are often applied to quite different physical phenomena. We refer a reader to the paper of Yung [509] where this question is discussed in detail. In 1953 A.F. Stevenson in two papers [458,460] generalized the Rayleigh theory, using the expansions of the fields in terms of ![]() ![]() ![]() |