| parfocal objectives | <microscopy> Objectives which are mounted so that only a small adjustment of the bodytube and stage is necessary to focus after changing from one objective to any of the others. They are mounted in such a way that the back focal plane is in the same position on the optical axis of the microscope for each objective. Objectives used on a rotating nosepiece are usually parfocal. Eyepieces are also parfocal within any given manufacturer's (05 Aug 1998) |
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| organizational objectives | The purposes, missions, and goals of an individual organization or its units, established through administrative processes. It includes an organization's long-range plans and administrative philosophy. (12 Dec 1998) |
| Flourite objectives | <microscopy> Microscope objective lenses considerably better corrected than achromats but not quite as well corrected as the apochromats. By using fluorite crystals (which have lower dispersion) in place of some of the glass elements, a fluorite objective corrects for spherical aberrations in three wavelengths at considerably lower cost than the apochromatis. (05 Aug 1998) |