Sumario: | The limiting angles for total reflection depend on the characteristics of the discontinuity surface (isotropic medium - biaxial crystal) and on the orientation of the principal axes refered to the incidence plane. In this paper a detailed description of this variation for different ways of cutting the crystal and different values of the refraction index of the isotropic medium is presented. Different situations in which, for the same interface, the total reflection condition is verified for certain incidence planes and is not verified for other are shown.
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