Ibn al-Haytham and the Book of Optics
This page delivers no verdict; it presents claims and evidence with their sources. No theory in science is absolute. Method
For everyone
Born in Basra, Ibn al-Haytham argued in his Kitāb al-Manāẓir (Book of Optics) that vision occurs not by rays leaving the eye but by light coming from objects to the eye. He studied the rectilinear propagation of light, reflection, refraction and the camera obscura by experiment, which is why some historians count him among the pioneers of the experimental method. Translated into Latin, the work influenced European optics up to Kepler.
For specialists
The work combines the theory of vision with mathematical optics, experiment (iʿtibār) and physiology. "Alhazen's problem" asks for the point of reflection on a spherical mirror for two given points, leading to a quartic equation, which he solved geometrically. The label "first scientist" is common in popular works; historians place his experimental approach within Ptolemy's optical tradition.
Claims
Evidence
Supporting
Images of different light sources entering a dark room through a small hole formed separately and inverted on the opposite wall, showing that light travels in straight lines.[1]
Challenging
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Connections
Parent
PhysicsArgues against
Sources
- Book (1989). The Optics of Ibn al-Haytham, Books I–III: On Direct Vision. The Warburg Institute, London (2 vols.)
- Encyclopediaİbnü'l-Heysem. TDV İslâm Ansiklopedisiislamansiklopedisi.org.trarchive
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Athena contributors. (2026). Ibn al-Haytham and the Book of Optics. Athena: The tree of human knowledge. Retrieved November 1, 2026, from https://latifkedi.github.io/athena/en/d/ibn-heysem/
@misc{athena_ibn_heysem,
title = {Ibn al-Haytham and the Book of Optics},
author = {{Athena contributors}},
year = {2026},
howpublished = {\url{https://latifkedi.github.io/athena/en/d/ibn-heysem/}},
note = {Athena: The tree of human knowledge. Accessed: 2026-11-01}
}Added: September 27, 2026 · Last changed: September 28, 2026 · Page history