If anyone has the time I could sure use some help creating three objects

First an annular parabolic mirror.
-Made of solid glass or hollow
-Having an adjustable parabolic curve in order to change the focal length
It would look like a clear or hollow  parabolic torus cut in half with 
its interior surface mirrored, interior media clear or hollow and its 
exterior opaque.

Second a parabolic mirror
-Made of glass and hollow
-Having an adjustable parabolic curve in order to change the focal length
It would look like a parabolic bowl with its interior surface mirrored, 
interior media clear or hollow, and its exterior surface opaque

Third an omni-directional mirror
-Made of glass and hollow
-Having an semitransparent external mirror coating while the interior 
would be fully transparent
It would look like a cone with a rounded apex with its exterior surface 
  coated with a semitransparent mirrored interior surface fully transparent

Thanks

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