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resolving power of Fabry-Perot etalon plates

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Could you please do the problem attached? Thank you.

A Fabry-Perot etalon is used to resolve two spectral lines of equal intensity, and wavelengths of 670.776 nm and 670.791nm. The etalon plates have a reflectivity R = 0.85.
Determine the minimum separation of the plates, d, for which the two lines are just resolved.

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At near normal incidence, the chromatic ...

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If determines the resolving power of Fabry-Perot etalon plates. The solution is detailed and well presented.