A square ring laser interferometer can be used to measure small vibrations in the earth by sending one laser beam clockwise

Question

A square ring laser interferometer can be used to measure small vibrations in the earth by sending one laser beam clockwise around the square and one laser beam anti clockwise around the square bouncing off mirrors at the corners see figure 3 They interfere at the opposite corner to where they are produced The detection limit is set by the interference pattern changing from constructive to destructive Laser light is produced Laser light interferes Figure 3 Schematic for question part c i If the lasers used have a wavelength of 520 nm what is the minimum length distortion the ring laser can measure ii Describe how a coating could be applied to one of the mirrors so at rest the interference is destructive interference 2

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