  The property of linear and circular birefringence at each point of the
optical medium has been evaluated here from differential matrix $N$ using the
Jones calculus.This matrix lies on the OAM sphere for $l=1$ orbital angular
momentum.The geometric phase is developed by twisting the medium uniformly
about the direction of propagation of the light ray. The circular birefringence
of the medium,is visualized through the solid angle and the angular twist per
unit thickness of the medium, $k$,that is equivalent to the topological charge
of the optical element.
