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- Dictionaryaperture/ˈapətʃə/
noun
- 1. an opening, hole, or gap: "the bell ropes passed through apertures in the ceiling"
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noun
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Hole or opening through which light travels
In optics, the aperture of an optical system is a hole or an opening that primarily limits light propagated through the system. More specifically, the entrance pupil as the front side image of the aperture and focal length of an optical system determine the cone angle of a bundle of rays that comes to a focus in the image plane. Wikipedia