Question: Rays from a uniform point and changing location of uniform point

I have the following maple file. Is it possible to instead of having the incoming rays at a vertical at intervals along the x axis, whether to have them emerging from a single point on the y axis, and also whether this point can moved up and down the y axis. Thanks View 3259_mirrorplot.mw on MapleNet or Download 3259_mirrorplot.mw
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