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Definition of "aperture" |
In optical instruments, it is the size of the opening admitting light. / In optics, an aperture is a hole or an opening through which light travels. More specifically, the aperture of an optical system is the opening that determines the cone angle of a bundle of rays that come to a focus in the image plane. The aperture determines how collimated the admitted rays are, which is of great importance for the appearance at the image plane. / (1) an opening to a cavity, or wave-guide, from which radiation is either received or transmitted. |
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