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We study propagation of high-frequency electromagnetic waves in a curvedspacetime. We demonstrate how a modification of the standard geometric opticsallows one to include the helicity dependent corrections into the equations ofmotion of circularly polarized beams of radiation. As a result, polarized lightrays are still null but not geodesic curves. To achieve these results weconstruct null frames associated with a set of (non-geodesic) null rays and usethese frames for description of the high-frequency wave propagation. We callthis approach spin optics approximation. It is completely covariant and it canbe used in an arbitrary time-dependent gravitational field.

Maxwell equations in a curved spacetime: Spin optics approximation