The geometry of an entry of a linearly polarized wave (angle of incidence – φ, angle of refraction – ψ) into the surface (xz plane) of an anisotropic optical medium (down), k is a wave vector in an anisotropic medium, s is a ray vector for one of the special cases, an upper area is an isotropic medium

 
 
  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