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Figure 2
(a) Ray-tracing illustration of focusing a collimated incident beam using a single spherical surface. The focal distance is F = 1000 cm and the lens diameter is h = 50 µm. Marginal rays (blue) are focused at A and paraxial rays (magenta) at B. (b) Evolution of the beam dimension (r.m.s.) for the full beam (black), marginal rays (blue), paraxial rays (magenta), rays at height h′ = ±0.866(h/2) (green) and rays at height h′ = ±0.707(h/2) (red).

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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