Ibn al-Haytham

Ibn al-Haytham was an 11th-century Arab mathematician, astronomer, and physicist whose experimental study of vision and light reshaped optics.

Optics: The study of light, its behavior, and its interactions with matter. The broad field his investigations transformed.
Rectilinear propagation of light: The principle that light travels in straight lines through a uniform medium. It underpins his geometrical explanations of vision and optical effects.
Book of Optics: Ibn al-Haytham’s Arabic treatise explaining vision and the behavior of light. This is his defining work on which his reputation in optics rests.
Experimental method: A systematic approach that tests explanations through controlled observation and intervention. His investigations used deliberate tests to distinguish competing accounts of light and vision.
Visual perception: The processes by which the brain interprets visual information from the eyes. His optical theory aimed to explain how seeing occurs.
Reflection: The change in direction of a wave when it encounters a boundary and returns to its original medium. He analyzed reflected light through geometric laws and experiments.
Abbasid-era science: Scientific scholarship developed under the Abbasid caliphate and its successor societies. His learning belonged to the wider Arabic scientific tradition.
Perspective (geometry): The mathematical study of how three-dimensional forms project onto a plane or into an image. His analysis of vision helped shape medieval mathematical accounts of perspective.
Ptolemy: A Greco-Roman astronomer and mathematician whose writings shaped medieval science. His optical work was a major source Ibn al-Haytham scrutinized.
Refraction: The change in direction of a wave as it passes between media with different propagation speeds. His studies examined how transparent media redirect light.

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