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carlob
5y ago
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Yeah but the acceleration from gravity is constant so maybe there is just a (possibly non linear) change of coordinates that can be applied to the regular paraboloid.
Also a paraboloid would work only for rays that are parallel to one another.
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mannykannot
5y ago
Another difference from optics is that the vlocity is not fixed, and that affects the extent to which gravity modifies the trajectory.
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