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This article is devoted to the results of an experimental test of thetheoretical assumption that the basic axiomatic postulate of statisticalphysics according to which it is equally probable for a closed system to residein any of the microstates accessible to it may be invalid for nonergodic cases.In the course of photometric experiments for the purpose of recording thepredicted loss of isotropy by a diffuse light field when it came into contactwith a two-dimensional phase-type diffraction grating, a significant deviationfrom Lambert's law was detected when the diffuse photon gas was scattered bythe grating surface. This caused angular anisotropy of the radiation fluxes toappear in the initially homogeneous light field. These results provide a basisfor revising the determination of the most probable macrostate of a closedsystem.

Breakdown of the isotropy of diffuse radiation as a consequence of its diffraction at multidimensional regular structures