It has been found experimentally that rays deflected near an edge of a thin opaque screen toward or outward the screen are repeatedly deflected by the second screen only in the directions toward the screen or outward it. The second screen was separated by less than 4.5 mm from the first one. The rays deflected toward and outward the first screen, upon passage of 25 mm, were deflected near the edge of the second screen both toward and outward it. Some rays passed near the screen edges without changing the direction.