WAVE SUBSTANTIATION OF GEOMETRICAL OPTICS
The article points out the lack of attention to the issue of wave substantiation of geometrical optics in the general physics training programmes. Eikonal, eikonal equation, optomechanical analogy, Fermat principle are considered in this connection. The solution for the light propagation problem in the flat-layered medium on the basis of the eikonal equation and Fermat principle is given as an example.