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<p>are used, so that counter-propagating light beams follow a closed path such as a triangle or square (Fig.&nbsp;1).  Alternatively <a href="page.php?w=fiber_optics">fiber optics</a> can be employed to guide the light through a closed path (Fig.&nbsp;2). If the platform on which the ring interferometer is mounted is rotating, the <a href="page.php?w=Interference_%28wave_propagation%29">interference fringes</a> are displaced compared to their position when the platform is not rotating. The amount of displacement is proportional to the angular velocity</p><p>
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