Figure 2: Scheme of a Michelson interferometer. When the end mirrors of the interferometer arms
are at rest the length of the arms is such that the light from the laser gets reflected
back entirely (bright port), while at the dark port the reflected waves suffer destructive interference
keeping it really dark. If, due to some reason, e.g., because of GWs, the lengths of the arms changed
in such a way that their difference was , the photodetector at the dark port should measure
light intensity .
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