Reflection and refraction
Acoustics - Propagation in a solid

Since, in an isotropic solid, a compression wave L (longitudinally polarized) and a shear wave T (transversely polarized) can propagate, any wave of vector k ^I originating from an isotropic solid (1) arriving on a surface in rigid contact with an isotropic solid (2) is, in principle, capable of generating :

• two reflected waves (L₁, T₁), of vectors k _L1, and k _T1 in solid (1) ;

• two refracted waves (L₂, T₂), of vectors k _L2 and k _T2, in solid (2).

In an anisotropic medium (crystal), three waves, a quasi-longitudinal wave L and two quasi-transverse waves T⁽¹⁾ and T⁽²⁾, of different speeds, are capable of propagating. So a wave from a crystal (1) arriving on a surface rigidly bonded to a crystal (2) is, in principle, capable...