File talk:Parabolique.png
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The figure is wrong. The curve labeled as "Sphérique" is supposed to represent a sphere that has the same curvature as the parabolic surface in its vertex (otherwise it wouldn't have any meaning). Well, the sphere in this figure is smaller than it should, and has its center in the focus. A correct sphere would have the center twice as far. --AdiJapan (talk) 07:49, 7 January 2009 (UTC)
