  Using a multiple-lens plane algorithm, we study light propagation in
inhomogeneous universes, for 43 different COBE-normalized Cold Dark Matter
models, with various values of the density parameter Omega_0, cosmological
constant lambda_0, Hubble constant H_0, and rms density fluctuation sigma_8.
This is the largest cosmological parameter survey ever done in this field. We
performed a total of 3,798 experiments, each experiment consisting of
propagating a square beam of angular size 21.9'' x 21.9'' composed of 116,281
light rays from the observer up to redshift z=3. These experiments provide
statistics of the magnification, shear, and multiple imaging of distant
sources. The results of these experiments can be compared with observations,
and eventually help constraining the possible values of the cosmological
parameters. Additionally, they provide insight into the gravitational lensing
process and its complex relationship with the various cosmological parameters.
