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REFLECTIONS: Measuring Sphericity

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Uploaded by on Sep 8, 2009

Senior Staff Scientist Thomas Humphrey invents a simple experiment to see if the Giant Mirror is spherical or parabolic. By placing a ping pong ball at the center of curvature, he's able to prove the mirror is out of pure sphericity by about one-quarter of one degree.

http://www.exploratorium.edu/reflections/

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  • I think we found the guy who tested the Hubble Space Telescope.

  • I consider myself a fairly smart guy, this made my brain hurt trying to keep up. Pretty cool.

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