| It was first described by the Arabic scientist Ibn Alhazen in the year 1021. | Beschrieben vom Wissenschaftler Ibn Alhazen... im Jahr 1021. Hanna (2011) |
| alhazen | (n) an Egyptian polymath (born in Iraq) whose research in geometry and optics was influential into the 17th century; established experiments as the norm of proof in physics (died in 1040), Syn. al-Haytham, Al-Hasan ibn al-Haytham, Ibn al-Haytham, Alhacen |