Gravitational lensing in a universe model with realistic mass distribution - II. Results

The light propagation in an inhomogeneous universe is studied using Monte Carlo methods. The model of matter distribution includes galaxies of different masses and radii and correlations in their positions. Different cosmological models are taken into account. The light beams are allowed to scatter several times between a source and the observer due to gravitational deflection caused by galaxies at different redshifts. Correlations in galaxy positions increase the probability of observing a distant source highly amplified by foreground gravitational lenses. The amplification bias of the quasar counts is weak, but noticeable at bright magnitudes