The Effect of the Emission Angle of the Light on Its Bending

Abstract

The aim of this work is to demonstrate the effect of light emission angle from some point in a strong gravitational field of its bending angle. For this purpose, the light bending from a point of high gravitational field to a weaker one is studied. The general relativistic equation of motion of a photon emitted from a point on a spherical static neutron star is solved to find the four velocity components, from these components, both emission angle and escape angle were found. A relation between those two angles is found, from this relation, it is deduced that light emitted in the radial direction suffers no bending while that emitted at right angle is reflected back. A relation relating the photon path and emission angle is also deduced.

Keywords: Light emission angle; Gravitational field; Light bending angle; General relativity; Escape angle.