From: "Bob May" 
To: "atmlist" 
Reply-To: "Bob May" 


I'll also note that the image of the light going past the KE on its way out
gets inverted (this is the way that the "slit" happens!  The
actual brightness of the mirror is a function of how much diffraction
happens to the light approaching the KE on its way back and the
differential brightness (from left to right sides of the mirror) is a
function of the angle of the surface of the mirror compared to what it
should be for a spherical surface of that ROC.  When the angle relative to
what it should be is wrong, the result from that part of the surface will
be either brighter or dimmer, depending upon the direction of the error and
its intensity. Bob May
http://nav.to/bobmay
bobmay{at}nethere.com
NEW! http://bobmay.astronomy.net

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