Applied Physics and Mathematics Annotation << Back On the physical nature of quantization of electromagnetic field Yu.L. Ratis It is postulated that general properties of material objects are finite size, inertness and ability to interact with other material objects. On the basis of the listed postulates it is shown that quantization of electromagnetic field is the results of interaction of the polarized physical vacuum and electromagnetic wave polarizing it. It is shown that the quanta of electromagnetic field (photon) have a time-dependent (oscillating) electric charge and nonzero rest mass. A direct consequence of all aforesaid are the uncertainty principle, a complementarity principle (corpuscularwave dualism) and observability of the electromagnetic field of 4-potentials, in particular, in the Aharonov – Bohm effect and other similar effects. The hypothesis on the physical nature of the dark matter is formulated. Keywords: quanta, photon, charge, mass, uncertainty principle. Contacts: E-mail: ratis@rambler.ru Pp. 03-16.