Can total internal reflection be used to create a source of light which will never be used up?
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The device you're describing is a perpetual-motion machine and it is therefore (like all such devices) impossible.
In particular, if you managed to engineer your device such that light cannot escape (which would also mean that light cannot enter, since electromagnetism is time-reversible, but never mind that), then it would be incapable of working as a light source since the light cannot escape.
The device you're describing is a perpetual-motion machine and it is therefore (like all such devices) impossible.
In particular, if you managed to engineer your device such that light cannot escape (which would also mean that light cannot enter, since electromagnetism is time-reversible, but never mind that), then it would be incapable of working as a light source since the light cannot escape.
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