A Fabry-Perot interferometer consists of two parallel partially-reflecting plate

Question

A Fabry-Perot interferometer consists of two parallel partially-reflecting plates placed a distance d from each other as shown. The beam that passes straight through interferes with the beam that reflects once off each of the mirrored surfaces. (The reflected beams are essentially perpendicular to the mirrors. The angles of reflection are exaggerated ? and unequal to the angles of incidence ? in this diagram.) For light of wavelength 622 nm, what is the smallest, nonzero value of d that results in constructive interference?

Explanation / Answer

The heart of the Fabry

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