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I have a 405nm laser pointer, which emits light right on the edge of the visible spectrum. It is easy to see that this wavelength of light appears out of focus through the eye likely due to chromatic aberration. I would imagine this is because our eyes are not made to see that kind of light. I've also noticed that mercury vapor streetlights have a faint ...


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Consider a wheel with just 4 spokes at 90 degrees to eachother, for simplicity. Your eyes / cameras and such perceive motion through series of 'snapshots' (frames on a film). If you see a spoke in nearly the same place as before, you would assume it is moving and has moved only by "that much". If the wheel spins in a way that each frame shows the same ...



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