Whose Law of Refraction?

Gorden Videen

The law of refraction is one of the most fundamental and important principles in optical science. After years of conflict over who discovered it first—Snel, Hariot or Descartes—some Arab scholars have now brought the 10th-century scientist Ibn Sahl into the fray. Here, Gorden Videen ponders the question: Can’t we all just get along?

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