Condenser height is controlled by a rack and pinion gear system that allows the condenser focus to be adjusted for proper illumination of the specimen. In practice, this can become tedious and is not commonly done in routine microscopy, but is essential when working at high resolutions and for accurate photomicrography using high-power (and numerical aperture) objectives. A microscope slide of thickness 1.20 mm is too thick to be used with most high numerical aperture condensers that tend to have a very short working distance.
The opening and closing of this iris diaphragm controls the angle of illuminating rays (and thus the aperture) which pass through the condenser, through the specimen and then into the objective. See also our brief History of the Microscope. Many manufacturers now produce a condenser which flips over completely when used with low power objectives. Most microscopes are supplied by the manufacturer with an Abbe condenser as the default and these condensers are real workhorses for routine laboratory use. How long will the footprints on the moon last? Sorry, this page is not
Explore how the substage condenser aperture controls illumination entering the objective. Those condensers that have a numerical aperture value of 0.95 or less are intended for use with "dry" objectives. Michael W. Davidson - National High Magnetic Field Laboratory, 1800 East Paul Dirac Dr., The Florida State University, Tallahassee, Florida, 32310.
The achromatic condenser illustrated in Figure 3 contains four lens elements and has a numerical aperture of 0.95, the highest attainable without requiring immersion oil.
Pagkakaiba ng pagsulat ng ulat at sulating pananaliksik?
Many manufacturers will synchronize this gradation to correspond to the approximate numerical aperture of the condenser.
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