Small problem regarding Parabolic Dish z=c(x^2+y^2)

pipc

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Nov 23, 2011
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I have the following "Parabolic Dish" z=c(x^2+y^2).

I have to prove that all the reflecting light rays that hit that dish go back through the same point Q in the Z axis, and then I have to find said point Q.

Please help :(
 
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