ابو سہل القوحی: گردانَن مَنٛز فَرَق

ابو سہل ویجان ابن رُستم القوحی Rustam al-Kūhī (al-Qūhīh ٲسؠ اکھاَکھ فارسی ریاضی دان طبیعیات دان تہٕ مٲہر فلکیات۔<ref>{{Cite journal|title=The first steps for learning optics : Ibn Sahl's, Al-Khayam's and Young's works on refraction as typical examples|url=http://spie.org/etop/2007/etop07fundamentalsII.pdf|journal=II|quote=The Perian Abu Sahl Wajjan Ibn Rustam Al-Quhi, also known as Abu Sahl Al-Kuhi or just Kuhi, studied optics and investigated the optical properties of mirrors made from conic sections}}</ref><ref>[http://adsabs.harvard.edu/abs/2000eaa..bookE3410.bookE3410۔ al-Qūhī, Abu Sahl Wayjan ibn Rustam (c.c۔ 940-c.c۔ 1000)]</ref>یمہٕ ٲسؠ تبارستان امول کِس أکس علاقس کوہ (یا قح) پؠٹھٕ، تہٕ گٕی ۱۰ ہمہ صٔدی منٛزمَنٛز [[بَغداد|بغدادس]] مٕنٛز آباد.