A popular introductory physics laboratory experiment is one focusing on Snell’s law. This is straightforward to complete with lasers and prisms, but here we present an alternative version that guides the students through some of the major historical developments, recreating and analyzing significant experiments. The discovery of Snell’s law has a fascinating, winding, global history, and the sine relationship eluded some of the greatest minds in optics for more than a thousand years.

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