'''ابن سہل''' (مکمل نام: Abū Sa 'd al-ʻAlâʼ ibn Sahal ʻAbou ād al-Âalāʼ bne Şahl Şahal Ş.Ş۔ ۹۴۰-۱۰۰۰ ′ اوس اَکھ فارسی ریٲضی دان تہٕ اسلٲمیاِسلٲمی سنہری دورُک طبیعیات دان یم سُنٛد تعلق [[بَغداد|بغداد]] کہ [[بویِد|بوید]] دربارس سٕتۍسٕتؠ اوس۔<ref>[https://books.google.com/books?id=_AUtLNtg3nsC&q=ibn+sahl+persian+mathematician%2FThe&pg=PA89 Enterprise of Science in Islam: New Perspectives] - J.J۔ P.P۔ Hogendijk, A.A۔ I.I۔ Sabra "The first clear evidence we have of a correct understanding of Ptolemy's theory of refraction does not appear in the Arabic sources available to us until the second half of the tenth century, when the Persian mathematician al-Ala ibn Sahl was able to put Ptolemy's ideas to use in formulating entirely original geometrical arguments for the construction of burning instruments by means of refraction"</ref><ref>http://www.iranicaonline.org/articles/optics,"There are a number of optical texts by authors with a Persian ethnicity or association.association۔ The earliest is Abu Saʿd al-ʿAlāʾ Ebn Sahl at the Persian Buyid court (945–1055), better known for his early conception of the “sine law of refraction” and burning mirrors (Rashed, 1990, pp.pp۔ 464-68; 1993; 2005) than his work on optics proper (Sabra, 1989, pp.pp۔ lix-lx; 1994)."</ref><ref>https://ijhpm.org/index.php/IJHPM/article/download/111/62,"Exploiting{{مۄردٕ جوڈ|date=January 2023}} {{Webarchive|url=https://web.archive.org/web/20191116142854/https://ijhpm.org/index.php/IJHPM/article/download/111/62 |date=2019-11-16 }} the 10th-century Persian
mathematician Ibn Sahl’s development on Ptolemy’s studies
of refraction,48 he generalized the relationship between incident
and refracted rays in a form that presaged Snell’s law."</ref><ref>https://www.sciencelearn.org.nz/resources/1867-light-ideas-and-technology-timeline,"Persian scientist Ibn Sahl writes On burning mirrors and lenses, which sets out his understanding of how curved mirrors and lenses bend and focus light.light۔ He discovers a law of refraction mathematically equivalent to Snell’s law (1615)."</ref><ref>{{کِتاب حَوالہٕ|last=Hogendijk|first=edited by Jan P.|title=The enterprise of science in Islam : new perspectives|last2=Sabra|first2=Abdelhamid I.|date=2003|publisher=MIT|isbn=0-262-19482-1|location=Cambridge, Mass.; London|page=89}}</ref> أمۍأمؠ سٕنٛد ناوس پیٚٹھ چھُنہٕ کینٛہہ تہِ خاص بس چُھچھُ أمۍأمؠ سٕنٛدۍسٕنٛدؠ ملکٕچ جھلک ہاونک اجازت دوان۔<ref>"Nothing in his surname and given names, however, allows us to glimpse either his country of origin or his social and religious allegiance — unless a link may be established with [[Al-Hasan ibn Sahl|another Ibn Sahl]] of the same period, who was an astrologer concerned with mathematics; for the time being, however, this connection has no historical value." Roshdi Rashed, '' Geometry and Dioptrics in Classical Islam'', London (2005), p.p۔ 3.</ref>
