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This is a
somewhat simplified duplicate of the interferometer that Michelson
used to disprove the existance of the ether. A laser is split into
two beams with a half-silvered mirror, sent off in different directions,
reflected back and recombined on a screen. The two beams interfere
with each other producing a series of bright bands. The bands can
be changed by slightly moving one of the reflecting mirrors, or
by removing the air from a chamber along the light path.
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Interferences visible on the white screen
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