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Geometry used (not to scale). We considered a thick slab, which can be taken as semi - infinite. This schema is a front view of the slab, as seen from the camera. The laser impinges at coordinates (x = 0, y = 0, z = 0). The camera is focused at the plane z = 0, which is the plane of the Figure, and a region of extension Dx × Dy is imaged onto the CCD.
