  The process of forming an image of a cosmological point source (CPS) in
condition of high optical depth is considered accounting for all types of
interactions. It is shown that the energy conservation law causes the size of
this image which is keeping constant over all redshifts of the CPSs. This
effect must be taken into account for the consideration of the angular power
spectrum of the CMBR. In particular, distant point sources and small scale
fluctuations which were damping before recombination will contribute their
energy in the region of angular scale \theta_0 \approx 20'.
