Kamal al-Din Hasan ibn Ali ibn Hasan al-Farisi or Abu Hasan Muhammad ibn Hasan (1267- 12 January 1319 (Persian: ?????????? ??????) was a prominent Persian born in Tabriz; Iran. He made two major contributions to science; one on optics; the other on number theory. Farisi was a pupil of the great astronomer and mathematician Qutb al-Din al-Shirazi; who in turn was a pupil of Nasir al-Din Tusi.

His work on optics was prompted by a question put to him concerning the refraction of light. Shirazi advised him to consult 'The Book of Optics' of Ibn al-Haytham (Alhacen); and Farisi made such a deep study of this treatise that Shirazi suggested that he write what is essentially a revision of that major work; which came to be called the Tanqih. Pictures From History