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| View Original: | Ibn_Sahl_manuscript.jpg (1139x1471) | |||
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| Keywords: Ibn Sahl manuscript.jpg Reproduction of a page of Ibn Sahl's manuscript showing his discovery of the law of refraction from Rashed 1990 The original ca 984 is public domain en Image Ibn Sahl fig jpg 2005-07-14 Ibn Sahl Abu Sa`d al-`Ala' ibn Sahl c 940-1000 PD-old Refraction History of geometry | ||||
