Formation of Neutral Points in the Polarization Characteristics of Secondary Radiation in the Semi-Infinite Medium Model

This article studies the polarization characteristics of diffusely reflected backward radiation when illuminating a semi-infinite, light-scattering medium with unpolarized radiation. The formation of neutral Babine, Brewster, and Arago polarization points in the angular polarization characteristics of the secondary radiation is shown. Comparison between the results of exact numerical calculations and approximate analytical formulas has been carried out and physical conditions for the appearance of neutral points depending on the angles of illumination and the multiplicity of scattering have been analyzed.