The story
Named for a tenth-century Arab mathematician Ibn al-Haytham, whose latinized name, Alhacen, may be rendered as Alhazen.
Etymology from Wiktionary, CC BY-SA 4.0.
Alhazen's problem
Today it means: A mathematical problem in which lines drawn from two points in the plane of a circle must meet at a point on the circumference, making equal angles with the normal at that point. Full definition →