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Figure 1
Illustrating the X-ray wave front and trajectories through an object. The direction of the X-rays is slightly deflected at the interfaces in accordance with Snell's law of refraction as in geometrical optics. However, the direction of deflection is not the same as that for visible light, because the refractive index for X-rays is slightly smaller than unity. X-rays are focused by a concave lens, and defocused by a convex lens.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 9| Part 3| April 2002| Pages 160-165
doi:10.1107/S090904950200554X
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