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Blog post: swansont: Bend it Like … Snell

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Optics basics: refraction

 

In short, refraction is the bending of a ray of light when it passes from one medium to another. Unlike optical phenomena like diffraction and interference, which usually require careful experimental preparation to be observable, refraction is readily seen all around us. If you’ve ever seen a seemingly bent straw in a glass of water, you’ve seen the effect of refraction.

 

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