Abstract
The problem of restricted three bodies is considered. The treatment is carried out within the framework of the post-Newtonian approximation. The primaries also are assumed to be radiant sources. The locations of the collinear points are computed. Series forms of these locations are obtained as new results. A Mathematica program is constructed so as to draw the locations of collinear points versus the whole range of themass ratio mu taking into account the photo-gravitational effects and/or the relativistic corrections. Analyses of these figures are addressed.