> If a parabola reflects parallel lines into its focus, what does a
> catenary do? What about non-parallel lines?

LOL at the typical response about burning the grass! I assume you are 
using a curved mirror like this because you want the light hitting the 
grass to be more intense than the light you'd get if you just pointed 
the grass straight at the sun. Why not just use a few flat mirrors 
angled correctly, that way you wouldn't need to worry about uniformity 
and they should be much cheaper to manufacture.

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