Re[2]: Question

["Peter Badcock"<pbadcock@xxxxxxxxxxxxxxx>]

Sorry to be picky, but I noticed you had an extra zero in your definition of a 
nano meter!  The prefix nano means '10 to the power of minus nine'. Which is the
reciprocal of 1 followed by nine zeros.  The correct number using four different
notations should read

1nm=0.000000001 meters
   =(1/1000000000) meters
   =1e-9 meters (using scientific notation)
   =1x10^(-9) meters

Actually what you specified was the unit of an 'Ångström' named after a Swedish 
physicist.  1Å = 1e-10 meters 

Anyway, none of this should affect the way we take photos so I'll finish up now 
:)

regards

Peter B



______________________________ Reply Separator _________________________________
Subject: Re: Question
Author:  <infrared@xxxxx> at INTERNET
Date:    12/12/98 13:05


A nm is .0000000001 of a meter. It is used as a measure of 
wavelength. 1nm is somewhere in xrays in the electromagnetic 
spectrum,
which would be above visible light. Some measure frequency 
instead using hertz(cycles/sec).
1000nm or also known as 1 micrometer would of course, put you 
below visible light in the intermedate infrared part of the 
spectrum.


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