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Will_Pearson comments on Distinct Configurations - Less Wrong
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Eliezer or anyone else: I am puzzled why the mirror itself doesn't act as a sensitive thingy. A mirror that deflects a photon gains some momentum (hence solar sails or whatever), so I'd expect the configurations to be
"Photon from A to B; and mirror at A with momentum X+e." (0 + -i) "Photon from A to C; and mirror at A with momentum X." (-1 + 0i)