  We give an exact self-consistent operator description of the spin and orbital
angular momenta, position, and spin-orbit interactions of nonparaxial light in
free space. Both quantum-operator formalism and classical energy-flow approach
are presented. We apply the general theory to symmetric and asymmetric Bessel
beams exhibiting spin- and orbital-dependent intensity profiles. The exact wave
solutions are clearly interpreted in terms of the Berry phases, quantization of
caustics, and Hall effects of light, which can be readily observed
experimentally.
