| plan apochromatic objective lens | <physics> A modern, high-numerical aperture microscope objective lens designed with high degrees of corrections for various aberrations. It is corrected for spherical aberration in four wavelengths (dark blue, blue, green, and red), for chromatic aberration in more than these four wavelengths, and for flatness of field. A single Plan Apo objective may contain as many as 11 lens elements. (05 Aug 1998) |
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| apochromatic objective | <microscopy> A lens system whose secondary chromatic aberrations have been substantially reduced. It is designed to provide the same focal length for three wavelengths and freedom from spherical aberration for two wavelengths of light. The magnification can still vary with wavelength in which case a compensating eyepieces used to cancel the coloured fringes. (05 Aug 1998) |
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| semi-apochromatic objective | <microscopy> A compromise, in the correction for chromatic and spherical aberration, between achromatic and apochromatic objectives, such as a fluorite objective. (05 Aug 1998) |
| apochromatic lens | A compound lens designed to correct both spherical and chromatic aberrations. (05 Mar 2000) |
| management plan | A plan guiding overall management of an area administered by a federal or state agency. A management plan usually includes objectives, goals, standards and guidelines, management actions, and monitoring plans. (05 Dec 1998) |
| plan | 1. A draught or form; properly, a representation drawn on a plane, as a map or a chart; especially, a top view, as of a machine, or the representation or delineation of a horizontal section of anything, as of a building; a graphic representation; a diagram. 2. A scheme devised; a method of action or procedure expressed or described in language; a project; as, the plan of a constitution; the plan of an expedition. "God's plans like lines pure and white unfold." (M. R. Smith) 3. A method; a way of procedure; a custom. "The simple plan, That they should take who have the power, And they should keep who can." (Wordsworth) Body plan, Floor plan, etc. See Body, Floor, etc. Synonym: Scheme, draught, delineation, plot, sketch, project, design, contrivance, device. See Scheme. Origin: F, fr. L. Planus flat, level. See Plain. Source: Websters Dictionary (01 Mar 1998) |
| health plan implementation | Those actions designed to carry out recommendations pertaining to health plans or programs. (12 Dec 1998) |
| source emission reduction plan | (SERP) A contingency plan developed to reduce emissions during an air quality emergency. (05 Dec 1998) |
| state implementation plan | A state plan required by the Clean Air act to bring nonattainment areas into compliance with federal ambient air quality standards. (05 Dec 1998) |
| nursing plan of care | The written framework that provides direction for the delivery of nursing care. (05 Mar 2000) |
| forest plan | The document that sets goals, objectives, desired future condition, standards and guidelines, and overall programmatic direction for a National Forest. Required by the National Forest Management act of 1976. (05 Dec 1998) |
| achromatic objective | <microscopy> An objective that is corrected chromatic for two colours, and spherically for one, usually in the yellow-green part of the spectrum. (05 Aug 1998) |
| homogeneous immersion objective | <microscopy> An objective to be immersed in a liquid of a certain refractive index and dispersion value as specified by the manufacturer of the objective. An oil-immersion objective, the most important type, is intended to be immersed in cedarwood oil (nD = 1.515) or in its manmade optical equivalent. A water-immersion objective is for dipping into an aqueous specimen mount. Alpha-monobromonaphthalene has such a high refractive index (nD = 1.66) that a very highly resolving objective (1.60 numerical aperture) was designed to be immersed in that liquid, for use by reflected light on metals and other opaque objects. (05 Aug 1998) |
| dark field objective | <microscopy> Certain objectives for high-power, dark fieldwork equipped with iris diaphragms or funnel stops so that their apertures may be reduced to correspond to the dark field con-denser with which they are used. (05 Aug 1998) |
| dry objective | <microscopy> Any microscope objective designed for use without immersion liquids. (05 Aug 1998) |
| immersion objective | <microscopy> An objective in which the medium of high refractive index and is used in the object space to increase the numerical aperture and hence the resolving power of the lens. See: homogeneous immersion of objective. (05 Aug 1998) |