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Reply #11: Look up "retroreflector" -- [View All]

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eppur_se_muova Donating Member (1000+ posts) Send PM | Profile | Ignore Mon Nov-07-11 02:17 AM
Response to Reply #9
11. Look up "retroreflector" --
I think these would be useful against that microwave device that produces a burning sensation as well. But you need to know what wavelength you're working with first. Sound waves may be too long for most types of retroreflector.

http://en.wikipedia.org/wiki/Retroreflector
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