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This is pretty useful too --
especially with ellipsoids (3-D ellipses).
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Here's an ellipsoidal reflector spotlight. |
And what about reflecting sound?
Some
science museums have what's called "whisper rooms." The ceiling
is an ellipsoid...
If you stand at one focus... and
whisper... someone standing at the other focus will be able to hear you
over a noisy crowd!
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