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[Physltest] [Phys-L] Re: 'Seeing' frequencies above 30-40Hz (fwd)

On Saturday, Jan 15, 2005, at 02:25 America/New_York, Bernard Cleyet
wrote:

still don't understand the problem. If memory isn't good enuff, then
persistence of vision will do it w/ a 5 mW LASER and a dark room.

You are correct. I just check it by rapidly tracing a curve on the
wall, with a red pointer. Thanks.
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