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In a waveplate made of a birefringent uniaxial material with an optical axis parrallel to the facets and where a monochromatic plane wave propagates, calculates the refraction angles corresponding to the ordinary and extraordinary polarizations as well as the phase shift order between the ordinary and extraordinary waves as functions of the wavelength, the refraction index of the incident medium, the ordinary refraction index, the extraordinary refraction index in a plane perpendicular to the optical axis, the incidence angle and the angle of the incidence plane with the plane defined by the optical axis and the normal to the facets.

Important: the angle r_e corresponding to the propagation of the extraordinary polarization is the angle of the wave vector with the normal to the interface and not the angle of the Poynting vector with the normal to the interface which is normally considered as the "refraction angle".