The principle of "wave-particle" dualism in quantum mechanics is introduced on the basis of the statement: all quantum objects behave as particles in some physical circumstances, and as waves in others. Using laser devices, we carried out simple demonstration experiments in physical circumstances in which the wave nature of the photon flow was expected to be revealed. Based on the analysis of these processes, we have easily shown that there are no empirical grounds for attributing a wave nature to quantum objects participating in these processes, i.e. photons. Analyzing the historical arguments for the introduction of the principle of duality, we conclude: the description of processes involving objects of the microcosm requires the creation of an alternative and more adequate theoretical concept than one based on the principle of dualism.