| numerical aperture |
A unitless measure of the ability of a lens to gather and focus light. NA = n sin q, where q is the angle of the light as it narrows to the focal point. A numerical aperture of 1 implies no change in parallel light beams. The higher the number, the greater the focusing power and the smaller the spot. Printer-Friendly Format
출처: www.dvd-makers.com/public/473.cfm
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| numerical aperture |
A ratio that describes the cone of light emitted by the condenser or accepted by the objective lens. Objectives with a larger NA have greater resolving power. (a 100x oil lens with a 1.25 NA can resolve smaller objects than a 100x lens with a 0.95 NA)
출처: www.bi-optic.com/vocab.html
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| numerical aperture |
The numerical aperture (NA) of an optical fibre defines the characteristic of the fibre in terms of its acceptance of impinging light. It can be calculated and expressed as an index (a number). The higher the number the more light than can be accepted.
출처: www.aefos.com/html/glossary/n.htm
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| numerical a. |
a measure of the efficiency of a microscope objective, being the product of the sine of one-half the angle of the aperture times the lowest refractive index of any medium between the objective and the specimen; usually abbreviated NA.
출처: www.mercksource.com/pp/us/cns/cns_health_library.j...
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| numerical c. |
see under taxonomy.
출처: www.mercksource.com/pp/us/cns/cns_health_library.j...
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