  In offered work short historical excursus to the classical theory of light is
presented: Grimaldi, Fermat, Newton, Huygens, Young, Fresnel, Fraunhofer, and
Gauss. The ray analog of wave model of light and Huygens-Fresnel's elementary
waves on the basis of consideration of geometrical model is offered. New
geometrical properties of Gaussian beams are analyzed. The new, generalized
interpretation of a corner of diffraction divergence of beams of light is
given. Difference of geometrical properties of wave fronts of infinite and
finite length is shown. Examples of possible application of our geometrical
model in various areas are given.
