Book of Optics
He then analyzed these physical rays according to the principles of geometrical optics. He wrote many books on optics, most significantly the "Book of Optics" ("Kitab al Manazir" in Arabic), translated into Latin as the "De aspectibus" or "Perspectiva", which disseminated his ideas to Western Europe and had great influence on the later developments of optics. Ibn al-Haytham was called "the father of modern optics".