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Optics: Lenses

When we think of glass and its uses, we generally think of windows, light bulbs, some laboratory equipment, drinking glasses, and perhaps some kinds of cooking dishes. All of these have one common property: even if they take on various shapes, they are of pretty much constant thickness. But what happens if we take a flat piece of glass and then make it thicker in the middle than around the edges? What if we make the edges thicker? If we do that, what happens to light passing through that piece of glass?

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