  Electron optics exploits the analogies between rays in geometrical optics and
electron trajectories, leading to interesting insights and potential
applications. Graphene, with its two-dimensionality and photon-like behavior of
its charge carriers, is the perfect candidate for the exploitation of electron
optics. We show that a circular gate-controlled region in the presence of
Rashba spin-orbit interaction in graphene may indeed behave as a Veselago
electronic lens but with two different indices of refraction. We demonstrate
that this birefringence results in complex caustics patterns for a circular
gate, selective focusing of different spins, and the possible direct
measurement of the Rashba coupling strength in scanning probe experiments.
