  In the current paper we consider the prospects of observation of
gravitationally lensed sources in far-infrared and submillimeter wavelength
ranges by the future space telescopes equipped with actively cooled main
mirrors. We consider the possibility of solving some of the important
cosmological and astrophysical scientific tasks by observation of
gravitationally lensed sources. The number counts of lensed sources for
wavelengths from 70$\mu m$ up to 2000$\mu m$ were calculated. We discuss the
distribution of lensed sources at different redshifts and magnification
coefficients and also mass distribution of lenses. Model sky maps that
illustrate the contribution of lensed sources were created.
