primary focus

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primary focus [′prī‚mer·ē ′fō·kəs]

(optics)

In an astigmatic system, a line at which some of the bundle of rays from an off-axis point meet; this line is perpendicular to a plane which contains the point and the optical axis, and has a smaller image distance than the secondary focus. Also known as meridional focus; tangential focus.

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Chandra X-ray Observatory
conservatory

Friedrich, Caspar David
meridional focus

metastasis
Programming languages

secondary focus
tangential focus

tangential surface

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