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For a Fabry Perot illuminated by a plane and monochromatic wave with a roughly defined wavelength, calculates the free spectral range, the exact resonnnant wavelength, the spectral width around resonnant wavelength (defined by the full width half maximum transmission), the finesse and the maximum reflectance as functions of the roughly defined wavelength, the thickness, the refraction index, the reflectance of the Fabry Perot surfaces and the angle of incidence.