Snell's law

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What Wikipedia says

Snell's law (also known as the Snell–Descartes law, and the law of refraction) is a formula used to describe the relationship between the angles of incidence and refraction, when referring to light or other waves passing through a boundary between two different isotropic media, such as water, glass, or air.

Excerpt from the Wikipedia article “Snell's law”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Zátonyi Sándor (ifj.) Fizped (talk), CC BY-SA 3.0, via Wikimedia Commons.