Re: IR filters

["scott miller" <macatawa@hotmail.com>]

>The same inverse square law that also applies to the reflected
>radiation.  The ratio between their strengths is independent of
>distance.
>

Wouldn't a very directional reflector maintian the laser's tight sine 
wave, and thus maintain the return beam focus much better than normal 
light?  The little spherical reflective beads in license plate paint are 
very directional reflectors, that's why they're the preferred targets 
for laser.  Scattered reflections from other surfaces ought to be much 
less directional, and lose strength as rapidly with distance as 
non-laser light.

Scott

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