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plotting - Normal lines to surfaces or planes in a 3D plot


How do I make the normal line to a plane actually look perpendicular?


cc = Plot3D[2 x + y, {x, -2, 2}, {y, -2, 2}, PlotRange -> {-4, 4}]

bb = ParametricPlot3D[{2 t, t, -t}, {t, -1, 1}, PlotStyle -> Thick]

Show[cc, bb]


Mathematica graphics


The line doesn't look even close to perpendicular to the plane.




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