  The propagation of electromagnetic waves in an unmagnetized weakly
inhomogeneous cold plasma is examined. We show that the inhomogeneity induces a
gauge connection term in wave equation, which gives rise to Berry effects in
the dynamics of polarized rays in the post geometric optics approximation. The
polarization plane of a plane polarized ray rotates as a result of the
geometric Berry phase, which is the Rytov rotation. Also, the Berry curvature
causes the optical Hall effect, according to which, rays of left/right circular
polarization deflect oppositely to produce a spin current directed across the
direction of propagation.
