MG11 
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JLenses: A Java Program to Visualize and Model Gravitational Lenses

Nowadays, Java is languaje very useful to simulate and visualize physical phenomena not only on PC computers, but in the internet. Astrophysical phenomena like Gravitational Lenses can be easily visualized under Java. Gravitational Lenses are an effect produced by deflection of light rays passing by stars, galaxies or cluster of galaxies. They could play an important rol in cosmology, because with them it is possible to estimate the age of the Universe. JLenses is a program intended for visualizing and model Gravitational Lenses. It has many applications and we will show some of them in this paper. The OpenGL library for Java is needed to run it. JLenses runs on all computer systems (Unix, Linux, Windows, etc.) We are preparing a Webpage to download it.