  We investigate imaging point sources with a monopole gravitational lens, such
as the Solar Gravitational Lens in the geometric optics limit. We compute the
light amplification of the lens used in conjunction with a telescope featuring
a circular aperture that is placed in the focal region of the lens, compared to
the amount of light collected by the same telescope unaided by a gravitational
lens. We recover an averaged point-spread function that is in robust agreement
with a wave-theoretical description of the lens, and can be used in practical
calculations or simulations.
