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Lecture 16: Camera & Lenses Cont. (25)

This looks like a case of parallel refraction in which the the ray enters and leaves are parallel to one another.


An interesting tidbit about refraction - because light obeys Snell's Law, it always takes the fastest path from point A to point B, not necessarily the shortest. Using this property and layers of media with decreasing densities, you can actually prove the shape of the path of least time - the brachistochrone. The mathematical proof can be seen here:,follows%20Snell's%20Law%20of%20Refraction.&text=where%20ni%20%3D%20c%2Fv,of%20light%20in%20medium%20i. But the gist it that the shape ends up being the trace of a circle which is pretty neat


Some intuition for indexes of refraction: the higher the index, the slower that light travels through the medium, and thus the more bent it gets as it travels through the medium.

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