>Cannot bend light beams with magnets (just charged particles.) Actually you can. Light carries both an electric and a magnetic field, though the magnetic field is too weak to implement a usable scanning light beam. Yesterday's Physics News Update (# 407) reported an experiment involving the interaction of the magnetic fields of electrons and terawatt laser light, an energy at which the magnetic component of light becomes nontrivial. You can also bend light beams remotely with matter that is neither charged nor magnetic, namely by gravitational attraction, a prediction of general relativity that was born out in practice many years later by observing the bending of starlight by Mercury. But this too is too weak to implement a scanning beam. Vaughan -- Subcription/unsubscription/info requests: send e-mail with subject of "subscribe", "unsubscribe", or "info" toWear-Hard Mailing List Archive (searchable): http://wearables.ml.org
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