Ab Al al-asan ibn al-asan ibn al-Haytham (965 in Basra - c. 1040 in Cairo) was a Muslim, Persian or Arab scientist and polymath. He is frequently referred to as Ibn al-Haytham, and sometimes as al-Basri, after his birthplace in the city of Basra. Read more
Al-Hayatham, known in Latin as Alhazen, wrote books on medicine as well as Mathematics, Physics and Astronomy. He wrote commentaries on the works of Aristotle and Galen, and also did original experiments with light, coming up with some of the first accounts of refraction, a mathematical method to find the focal point of a concave mirror, and a refutation of the Greek theory that vision worked because the eye sent out rays to the object that was observed. Al-Hayathams work had a major impact on the Europeans Roger Bacon and Johannes Kepler.