achromatic objective


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objective

 [ob-jek´tiv]
1. perceptible by the external senses.
2. a clear, concise declarative statement that directs action toward a specific goal.
3. the lens or system of lenses of a microscope nearest the object that is being examined.
achromatic objective one in which the chromatic aberration is corrected for two colors and the spherical aberration for one color.
affective objective a statement of expectations regarding changes in attitude or feelings.
apochromatic objective one in which chromatic aberration is corrected for three colors and the spherical aberration for two colors.
behavioral objective a written statement identifying an action or pattern of actions to be expected after an intervention.
cognitive objective a statement of expectations regarding knowledge.
flat field objective a microscopic objective that provides an image in which all parts of the field are simultaneously in focus.
immersion objective one designed to have its tip and the coverglass over the specimen connected by a liquid instead of air.
psychomotor objective a statement of expectations regarding the acquisition of skills.

ach·ro·mat·ic ob·jec·tive

an objective that is corrected for two colors chromatically, and one color spherically.

ach·ro·mat·ic ob·jec·tive

(ā-krō-mat'ik ŏb-jek'tiv)
An objective that is corrected for two colors chromatically, and one color spherically.

achromatic objective

A microscope objective in which chromatic aberration is corrected for red and blue light.
See also: objective
References in periodicals archive ?
Kulibin also crafted flint glass for making achromatic objective lenses.
By folding the optical train in half, you can use a long-focus achromatic objective lens.
For a projection telescope, I used an inexpensive department-store refractor, which has a surprisingly good 60-millimeter-diameter air-spaced achromatic objective lens of 700 mm focal length.