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What does NA stand for?

NA stands for Numerical Aperture (fiber optics)

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Introduction. The numerical aperture of a microscope objective is the measure of its ability to gather light and to resolve fine specimen detail while working at a...
This interactive tutorial demonstrates the change in numerical aperture light cones displayed by a microscope objective with corresponding changes in the angular...
In optics, the numerical aperture (NA) of an optical system is a dimensionless number that characterizes the range of angles over which the system can accept or emit...
back. The numerical aperture is the same concept as f/number but on the front of the lens. Whereas the f/number determines the image resolution, the numerical...
Medical Definition of NUMERICAL APERTURE: a number that indicates the resolving power of a microscope objective and is equal to the product of the index of refraction...
Numerical Aperture and Resolution. The numerical aperture of a microscope objective is a measure of its ability to gather light and resolve fine specimen detail at a...
Numerical Aperture (also termed Object-Side Aperture) is a value (often symbolized by the abbreviation NA) originally defined by Abbe for microscope objectives and...
Numerical Aperture Light Cones Explore how the size and angular aperture of the light cone captured by a microscope objective changes with numerical aperture.