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)
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)