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The angular aperture a {\displaystyle a} of a lens is the angular size of the lens aperture as seen from the focal point:
Relation to numerical aperture & Overview
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aperture angular numerical lens displaystyle air size seen focal point relation references see also
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Angular aperture | related to Relation to numerical aperture | In | 0.60 | section |
| Angular aperture | related to Relation to numerical aperture | Formally | 0.60 | section |
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