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Figure 1
Illustration of refraction from a single interface separating two media with refraction indices n1 and n2. (a) A hyperbola focusing a parallel beam travelling in a medium with n1 > n2. (b) A Cartesian oval focusing a divergent beam travelling in a medium with n1 > n2. (c) An ellipse focusing a parallel beam travelling in a medium with n1 < n2. (d) A Cartesian oval focusing a divergent beam travelling in a medium with n1 < n2.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 19| Part 3| March 2012| Pages 366-374
doi:10.1107/S0909049512003020
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