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Figure 10
Elliptical mirror geometry. The lengths of the axes of the ellipse are 2a and 2b, and the eccentricity is defined as e = (1-b2/a2)1/2. Rays propagate from the source located at focal point F2, are reflected at the mirror surface, and create an image at focal point F1. For grazing-incidence optics the eccentricity is very close to 1, and the angles [\phi], [\theta] and [\varphi] are very small.

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