The reflector problem

[T3D john bercovitz <bercov@xxxxxxxxxxx>]

In another list, we determined that the light coming from a point 
source located at the focus of a paraboloid is not even across the 
exit of the paraboloid.  This means a paraboloid would not make a 
good reflector for a stereo viewer.  The red button uses some sort 
of reflector.  How was its shape determined?  Remember there is a 
complicating factor here: the red button's surface is painted 
white and so is a rough (perhaps very rough?) approximation of a 
Lambertian surface.  What effect does this have?  What is the 
correct shape for a viewer reflector?
 
Thanks,
John B


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