Figure 1
(a) Geometric (virtual) focus of two incoming monochromatic rays by a bent Laue crystal. (b) The single-ray (virtual) focus of a polychromatic beam by a bent Laue crystal. (c) The two crystals aligned such that the single-ray and geometric foci of the first crystal coincide with each other and with the geometric focus of the second crystal. The first crystal satisfies the `magic condition'. |