Kamal al-Din Hasan ibn Ali ibn Hasan al-Farisi or Abu Hasan Muhammad ibn Hasan (1267– 12 January 1319 (Persian: كمال‌الدين فارسی‎) 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 st


Kamal al-Din Hasan ibn Ali ibn Hasan al-Farisi or Abu Hasan Muhammad ibn Hasan (1267– 12 January 1319 (Persian: كمال‌الدين فارسی‎) 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.


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