Ibn al-Haytham Writes Book of Optics
c. 1011-1021 · Medieval
Arab scholar Abu Ali al-Hasan ibn al-Haytham composed the seven-volume Kitab al-Manazir while under house arrest in Cairo during the reign of Fatimid caliph al-Hakim. The treatise rejected the prevailing extramission theory that eyes emit rays, demonstrating through controlled experiments that vision results from light reflecting off objects and entering the eye. Ibn al-Haytham described the behavior of light through pinholes, analyzed reflection and refraction, and investigated the anatomy of the eye. Latin translations influenced Roger Bacon, Johannes Kepler, and other European scholars.
Key Figures
Ibn al-Haytham
Locations
Cairo
Topics
Islamic Golden Ageexperimental methodologyoptics and light theoryintromission theory of visionpinhole camera principlescientific method
Connected Events — 3 Connections
Understanding of refraction and lenses contributed to later optical instrument development Invention of the Telescope
Newton's work on optics built upon the experimental tradition Ibn al-Haytham established Newton's Principia Published
The Book of Optics built on his earlier critique of Ptolemaic models Ibn al-Haytham's Doubts on Ptolemy
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