  Compact objects with a light sphere such as black holes and wormholes can
reflect light rays like a mirror. This gravitational lensing phenomenon is
called retrolensing and it is an interesting tool to survey dark and compact
objects with a light sphere near the solar system. In this paper, we calculate
the deflection angle analytically in the strong deflection limit in the
Reissner-Nordstrom spacetime without Taylor expanding it in the power of the
electric charge. Using the obtained deflection angle in the strong deflection
limit, we investigate the retrolensing light curves and the separation of
double images by the light sphere of Reissner-Nordstrom black holes.
