Ibn Sahl

Mathematician (0940-1000) · Academics

Ibn Sahl was a Persian mathematician and physicist of the Islamic Golden Age, associated with the Buyid court of Baghdad. Despite attempts by professionals in the field of onomastics, neither his country of origin nor his religious allegiance could be parsed.

Ibn Sahl is read about 53 times a day, in 23 languages.

A typical day, 30 days to 6 November 2026

The middle day of the days counted, so one week of news cannot move it. The line under it is the last 104 days, one point a day.

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$Reproduction of Millī MS 867 fol. 7r, showing his discovery of the law of refraction (from Rashed, 1990). The lower part of the figure shows a representation of a plano-convex lens (at the right) and its principal axis (the intersecting horizontal line). The curvature of the convex part of the lens brings all rays parallel to the horizontal axis (and approaching the lens from the right) to a focal point on the axis at the left.$ Reproduction of Millī MS 867 fol. 7r, showing his discovery of the law of refraction (from Rashed, 1990). The lower part of the figure shows a representation of a plano-convex lens (at the right) and its principal axis (the intersecting horizontal line). The curvature of the convex part of the lens brings all rays parallel to the horizontal axis (and approaching the lens from the right) to a focal point on the axis at the left.

About this person

Academics born in the 940s 6

Abu Sahl al-Quhi50.7 of 100

Abbo of Fleury49.3 of 100

Abu al-Wafa' Buzjani53.4 of 100

Ibn Furak48.9 of 100 Al-Shaykh Al-Mufid54.0 of 100

Ibn Jinni46.3 of 100