The principle of the Huygens in classical statement ("each point of a wavefront set starts to a radiant of a spherical wave, and the position of front is as a superposition of elementary spherical waves") is inexact. At addition of elementary waves there should be still front behind of primary, that it is necessary frequently artificially to ignore [1].

The statement of the problem about a radiation of the fractal surface element enables to estimate presence of front of a radiation behind of initial front.