Hello Lark!
I think that POV-Ray cannot do what you want just because only light ray
originating from the camera are refracted by objects having some refraction
value in the inside{} satement. You want to refract light rays originating from
the light source! To my humble knowledge light rays from light sources can only
be attenuated by objects between the source and the tested surface. This is
because the ray is traced back to the source and not from the source to the
lighted surface...
Greetings
   Karl-Heinz


Lark schrieb:

> ...looks through it.  But what I really want the lense for is to split up a
> beam of light.  I am trying to use a spotlight or cylindrical light, but
> when they pass through the lense they are unaffected.  I have tried the...
>

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