Used as evidence for the special theory of relativity, it involved looking for fringes of light separated by dark stripes.  
Used as evidence for the special theory of relativity, it involved looking for fringes of light separated by dark stripes.  In order to maximize the shift, the experiment was repeated, increasing the length of the beams by repeated reflections.  In it, a beam of light was split by a reflecting mirror into two perpendicular beams, then reflected back to the source and recombined.  The apparatus was rotated in such a way that the interference pattern would have changed if the light was traveling through ether, but this proved not to be the case.  For ten points, name this experiment, which used an interferometer.
Used as evidence for the special theory of relativity, it involved looking for fringes of light separated by dark stripes.  
{Michelson}-{Morley} experiment (accept {Morley}-{Michelson})