Numerical aperture

Numerical aperture

The product NA of the refractive index N of the medium in image space by the sine A of the half angle of the cone of illumination there. In microscopic optics, this definition with object space substituted for image space is preferred.

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Part of Speech: noun
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Industry/Domain: Earth science
Category: Mapping science
Company: American Congress on Surveying & Mapping
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Related terms

numerical aperture

Biology; Microbiology

The property of a microscope lens that determines how much light can enter and how great a resolution the lens can provide.

numerical aperture

Legal services; DNA forensics

A measure of the information-collecting ability of a microscope optic. The greater the NA, the better the resolving ability. It is a measure of the light-gathering capacity of the ...

numerical aperture

Earth science; Mapping science

The product NA of the refractive index N of the medium in image space by the sine A of the half angle of the cone of illumination there. In microscopic optics, this definition ...

numerical aperture loss

Telecommunications; General telecom

A loss of optical power that occurs at a splice or a pair of mated connectors when the numerical aperture of the "transmitting" fiber exceeds that of the "receiving" fiber, even ...

launch numerical aperture (LNA)

Telecommunications; General telecom

The numerical aperture of an optical system used to couple (launch) power into an optical fiber. Note 1: LNA may differ from the stated NA of a final focusing element if, for ...

numerical aperture (NA)

Semiconductors; Test equipment

A term representative of the angle included by a cone of light accepted by the objective of a microscope. The higher the NA, the greater the resolving power.

subtropical

Earth science; Mapping science

Relating to the warmest region of the Temperate Zones that border on the Torrid Zone.

sky

Earth science; Mapping science

The region above and beyond the Earth, as it is seen looking up from the ground. Sky looks blue during the day and dark at night.

South Pole

Earth science; Mapping science

The most southern point of the Earth. The South Pole is the southern end of the axis on which the Earth rotates.

prime meridian

Earth science; Mapping science

The line of longitude that passes through the town of Greenwich, England, and that measures 0 degree. It is the line from which other longitude lines are measured.

planet

Earth science; Mapping science

A celestial body revolving around a sun in a nearly circular orbit. This definition excludes comets, which have highly elliptical orbits. However, it may also exclude some of ...

area of error

Earth science; Mapping science

A figure within which the true location of a point whose location has been determined by measurement is believed to lie, with stated degree of probability.

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