> It will work, it's the basis of some shop door beepers. I've got a friend=
's
> here right now. It's not very well. The reflector is faceted, presumably =
to
> bounce signal back to whence it came at whatever angle it whenced. Not
> as good as the one they left on the moon probably. It's a similar effect =
to
> the retroreflective coating on road signs

As in bicycle reflector.


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