β Scribed by P. Phariseau
No coin nor oath required. For personal study only.
We establish a system of linear and homogeneous equations describing the diffraction of light by a three-dimensional system of ultrasonics. In order to find solutions of this system we lollow a well-known method of first approximation (l). This enables to explain diffraction patterns of the first order. To obtain explicit expressions for the intensities we are obliged to distinguish carefully between the Laue-case and Braggcase. In some circumstances, total reflection is possible. Neglecting the absorption we have verified the conservation of energy. The reflections in the disturbed slab satisfy nearly the Bragg-law.
π SIMILAR VOLUMES
We establish a system of difference-differential equations describing the diffraction of light by two mutually perpendicular supersonic waves. When the two supersonics have intensities of the same order of magnitude, we prove that the integration of these equations is reduced to the integration of t