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Howto vary reflection coefficient?

From: Roland Orre <>
Date: Fri, 1 May 1998 15:49:12 +0200 (MET DST)

This summer I guess that I may afford one of these VGA-chips
out there. What I will do then is the following goggles, or
complement to my ordinary glasses. Sorry for the proportions...

             left eye of prescription glasses
           M (....................................)
           M      
=================\
  |             .   \
V |            . .     \
G |           .   .       \
A |          .     .          \    <==== 45 degree semi-see-through
- |          .     .              \           mirror.
C |          .     .                  \
H |           .   .                      \
I |            . .                          \
P |             .                              \
====================-------------------\
                            ....
                         .         .
                       .   Eye-ball  .

It would be nice to be able to adjust the reflection coeffient of the
mirror between 0-100 %. I've forgotten all my physics, does anybody
know how to do that? What materials to use?

	Best regards
	Roland Orre

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