Ibn Sahl (mathematician) (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Ibn Sahl (mathematician)" in English language version.

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Kurt Bernardo Wolf, Geometric Optics on Phase Space, p. 9, Springer, 2004, ISBN 3-540-22039-9 online
Enterprise of Science in Islam: New Perspectives - J. P. Hogendijk, A. 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"
Smith, A. Mark (2015). From Sight to Light: The Passage from Ancient to Modern Optics. University of Chicago Press. p. 178. ISBN 9780226174761.

https://ijhpm.org/index.php/IJHPM/article/download/111/62,"Exploiting^{[permanent dead link]} 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."

http://www.iranicaonline.org/articles/optics,"There are a number of optical texts by authors with a Persian ethnicity or 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. 464-68; 1993; 2005) than his work on optics proper (Sabra, 1989, pp. lix-lx; 1994)."

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. He discovers a law of refraction mathematically equivalent to Snell’s law (1615)."

http://spie.org/etop/2007/etop07fundamentalsII.pdf," R. Rashed credited Ibn Sahl with discovering the law of refraction [23], usually called Snell’s law and also Snell and Descartes’ law."