Q: How Snell's law (a.k.a. Snell–Descartes law or law of refraction) affects the design of camera lenses?
In every single school, all over the world, Snell's law is presented by the same examples including the "bending" of a straw emerged in a glass of water.
Are there some more advanced practical implications important for lens design?
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affects the design of camera lenses?