Ibn al-Haytham's student — Kamal al-Din al-Farisi

كَمَال الدِّين الفَارِسِي

First to correctly explain the rainbow

Born: 1267 CE, Tabriz

Died: 1319 CE, Tabriz

Era: Medieval

Field: Physics, Mathematics

Origin: Tabriz, Persia

Kamal al-Din al-Farisi was a 13th-century Persian mathematician and physicist who gave the first correct mathematical explanation of the rainbow — describing it as caused by refraction and internal reflection of sunlight in water droplets.