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one on top of the other. Say, with a partially silvered mirror. If you couldBut: What if you were able to get 2 beams to travel in the same direction,
get two out-of-phase waves to travel in the same direction, one behind the
other, you could achieve total cancellation. The beams would never diverge,
so there would be no point where the energy reappears - it would effectively
be gone forever.
Would this be possible? I'm assuming not, but why not?