  The deflection of light's trajectory has been studied in many different
spacetime geometries in weak and strong gravity, including the special cases of
spherically symmetric static and spinning black holes. It is also well known
that the rotation of massive objects results in the dragging of inertial frames
in the spacetime geometry. We present here a discussion of the asymmetry that
appears explicitly in the exact analytical expression for the bending angle of
light on the equatorial plane of the spinning, or Kerr, black hole.

General Relativity and Quantum Cosmology