3 relations: Aperture, Optical axis, Optics.
Aperture
In optics, an aperture is a hole or an opening through which light travels.
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Optical axis
An optical axis is a line along which there is some degree of rotational symmetry in an optical system such as a camera lens or microscope.
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Optics
Optics is the branch of physics which involves the behaviour and properties of light, including its interactions with matter and the construction of instruments that use or detect it.
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