Re: [ATM] mirror or lens?

["Goat Tosser" <goat@access.bpa.nu>]

----- Original Message ----- 
From: <clnoble@email.arizona.edu>
To: <atm@atmlist.net>
Sent: Tuesday, August 02, 2005 4:22 AM
Subject: Re: [ATM] mirror or lens?


> When optical engineers do ray traces on optical systems, many just 
> consider a
> mirror to be a lens with a negative index of refraction, so that when 
> light
> hits it, it goes the opposite way from which it came.  This may be what he 
> was
> referring to, but it does not mean a lens is neccesarily a mirror.

. . . and cold is merely the absence of heat, dark is the absence of light.
 Each is the opposite ends of the same stick. 

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