You prol'ly mean Fresnel Lense. Oriigially developed by a Frenchman and
applied to light houses. The were fantastic for collecting the light
from a lantern, concentrating it into a beam that could be projected for
miles across the water. Most Fresnel lenses were made up of glass pieces
that has a triangular cross section. The pieces were organized into
concentric circles and the angle of the glas set to collect light from
onw directtion and through the prism effect of the triangular cross
section, concentrate the light and project it as narrow beam of light.
The Fresnel mirror is doing the same thing, but just collecting
naturally reflected light which it projects for you to see as an image
it the miror.

Very cool concept.

Regards,

John Rodgers
88 GL Driver

karen davis wrote:

> Got a fresno lens because it's hard for me to see towards the
> passenger side
> due to the mirror constantly moving.  Where is the best place to place
> this
> fresno on the back window to see more towards the passenger side?  I
> have it
> in the middle...then I tried moving it towards the passenger side but
> still
> doesn't seem to show lots of the passenger side.
>
> I can't furgure out how to place it best if I want to see more towards
> the
> passenger side.  I can see well on the drivers side since that side
> mirror
> doesn't have themoving  problem.  thanks for any advice.
>
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