  In this paper the kinematical correlations from the phase conjugated optics
(equivalently with crossing symmetric spontaneous parametric down conversion
(SPDC) phenomena) in the nonlinear crystals are used for the description of a
new kind of optical device called SPDC-quantum mirrors. Then, some important
laws of the plane SPDC-quantum mirrors combined with usual mirrors or lens are
proved only by using geometric optics concepts. In particular, these results
allow us to obtain a new interpretation of the recent experiments on the
two-photon geometric optics.
