For description of adaptive systems for atmospheric distortions compensation a common assumption is that intensity of radiation is scattered from the target, small enough to affect the propagation of an incident wave. In this paper the mutual effects of the incident and backscattered radiation is considered. This consideration is made for that case when the target is a small mirror. Solutions of the equations of paraxial optics exist in a form of beams which collapse on scatterers for beam power P$GREQ@P$- approximately icron$/3, where P$- approximately icron$/ is threshold power the beam collapse in absence of a scatterer dimension tends to zero. The problem of physical realization of the self-focusing on the scatterer is discussed. By means of numerical simulation it is shown that for monotonously increasing beam power P the back scattering leads to self-focusing on small scatterers only if P$GREQ@P$- approximately icron$/.
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