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The Trail of a Newcomer (475 mW and Questions)

Swesent

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And finally the last one - sooo sorry, but my hand is forced...

Peace!
 

kristopher

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Since nobody answered your question #4, I'll take a stab.

Basically air (normal air) transmits visible light very good - soo good, in fact, that it makes it from the sun to here!  As shown here: http://en.wikipedia.org/wiki/Image:Solar_Spectrum.png there are some wavelengths that air (actually the moisture in air) will absorb light.  But, aside from these, basically the transmission is 99.99% or better!  Because the beam diverges, the power density gets less and less, though.  So, at 3 miles, the power is basically the same.  Optics (like mirrors, etc) have wavelength dependent transmission/reflection due to the material properties.  Even plain glass reflects about 10% of the light.

K
 




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