  Weak measurements have recently allowed for the observation of the spin-Hall
effect of light in reflection or transmission, which is a spin-dependent light
beam shift orthogonal to the plane of incidence. We report here the observation
of the Imbert-Fedorov shift via a weak value amplification scheme. The
Imbert-Fedorov effect does not depend on the spin of the incident photon only,
but it has richer polarization dependence. We prove that weak measurements
allow for a complete experimental characterization of the polarization
properties of this tiny optical effect.
