Strong gravitational lensing by Schwarzschild black hole
arXiv:1208.3306
Abstract
Schwarzschild black holes can produce strong gravitational lensing. The relativistic images are produced due to bending of light around the black hole. We propose a model equation to study the strong gravitational lensing. The model equation can well describe the bending angle from a range very close to the photon sphere to the first relativistic image.
4 pages, 6 figures