angular aperture

noun

Medical Definition of angular aperture

: the angle subtended at the principal focus of an optical system (as a microscope) by the diameter of its entrance for light

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“Angular aperture.” The Merriam-Webster.com Medical Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/medical/angular%20aperture. Accessed 6 December 2019.

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