The numerical aperture is , where is the refractive index of the medium between object and objective, and is the half-angle of the admitted cone of light. Specify object-side or image-side numerical aperture; the microscope convention usually means the object side.[ref]

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Numerical aperture by Wikipedia Bot 1
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Numerical aperture (NA) is a dimensionless figure that characterizes the range of angles over which a lens can accept or emit light. It is a critical parameter in microscopy and optics, particularly when discussing the resolution and light-gathering ability of lenses.
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