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Evidence that light travel in a straight line?

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June 22, 2012 5:18PM

I can't really think of any "evidence" of this that isn't trivially obvious. Take an object. Put something in between you and the object. Can you still see it? Then light must travel in a straight line.

However... in fact, light does not travel in a straight line, it travels along a geodesic path, which ordinarily happens to be very, very close to a straight line. Near very massive objects, though, geodesics are not even close to straight lines.