# Alhazen's problem

Definition from Wiktionary, the free dictionary

## English[edit]

### Etymology[edit]

Named for a tenth-century Arab mathematician Ibn al-Haytham, whose latinized name, Alhacen, may be rendered as Alhazen.

### Noun[edit]

**Alhazen's problem** (*uncountable*)

- (mathematics) 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.