ibn al-haytham

Science Dictionary
Ibn al-Haytham (ĭb'ən ěl-hī'thəm), Abu 'Ali al-Hasan Also known as Alhazen   (ĭb'ən ěl-hī'thəm)  Pronunciation Key 
Arab mathematician who wrote almost 100 works on mathematics, astronomy, philosophy, and medicine, but who is best known for his book on optics, which became very influential in Europe after it was translated in the 13th century. It contained a detailed description of the eye and disproved the older Greek idea that vision is the result of the eye sending out rays to the object being looked at.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
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ibn al-haytham

mathematician and astronomer who made significant contributions to the principles of optics and the use of scientific experiments.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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