The section of a wave surface and of a ray surface in plane of incidence/reflection (xy) for ordinary (contours green, violet) and extraordinary (contours black, red) waves via a refractive angle for a one particular type of anisotropy (31). As before kxy and kz are wave vectors, sxy and sz are ray vectors. The elongated figures – for an extraordinary wave (30), a circle – for an ordinary wave (28). During construction of sxy and sz contours a real meanings were multiply by three

 
 
  Part of: Sobol VR, Silibin MV, Karpinsky DV (2024) To a dispersion law of an electromagnetic wave in a medium having a double anisotropy. Modern Electronic Materials 10(2): 103-113. https://doi.org/10.3897/j.moem.10.127996