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secondary focus

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secondary focus [′sek·ən‚der·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 lies in a plane which contains the point and the optical axis, and has a greater image distance than the primary focus. Also known as sagittal focus.


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Another plan is to utilize the space for a sunken rock garden, and yet another is to make a central group of beds upon it, which in the case of a square space becomes an attractive secondary focus.
It takes a practical, problem-oriented approach to the subject, with a strong focus on legal texts and case law and a secondary focus on trade policy and theory.
A primary focus will be the risk factors and the determinants of health, with a secondary focus on diseases and other health conditions.
 
 
 
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