Simulations of Gravitational Lensing, and Other Lensing Systems

Abstract

I discuss the phenomenon of gravitational lensing, starting with fundamental principles of light and lenses and moving on to the necessary tools of General Relativity. Along the way, I stress the connections between these gravitational lenses, classical lenses, and atmospheric refraction. My motivation is to use the relevant equations to write a computer program to simulate these lensing effects. The general algorithm for this program is explained, and its results are qualitatively analyzed and checked against existing programs.