Paraboloid
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“It will be seen that the parabolic mirror a is at best but a very imperfect instrument, for even if the radiant were strictly a mathematical point, the cone of rays (shown undotted) escaping past the lips of the mirror must be lost.” —The Encyclopedia Britannica, 1910
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Miscellaneous OpticsSource
The Encyclopedia Britannica, New Warner Edition (New York, NY: The Werner Company, 1893)
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