Numerical Aperture & Acceptance Angle of an Optical Fiber Experiment
Numerical Aperture. Numerical aperture (NA) is defined as being equal to n sin θ, where n is the refractive index of the medium between the objective lens and the object (n≅1 for air) and θ is half the angular aperture (or acceptance angle of ima...See more
ge-forming rays) of the objective lens (Jenkins and White 1957).
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