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Physics: Who discovered the law of refraction?

Posted by Lawan Dalha
For many years, the law of refraction in physics was attributed to Dutch physicist, Willebrord Snellius, thus the name “Snell’s law of refraction. Then it was discovered that the law was actually discovered and written down by 650 years ago by a Persian mathematician and physicist, Ibn Sahl. In this video, Prof Jim Al Khalili says it should actually be Ibn Sahl law of refraction. Video credit: Al Jazeera
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