aperture (English) [ IPA: ˈæpəˌtʃʊr ASM: এপাৰ্চাৰ]
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    Contributed by: Rubul Mout (ৰুবুল মাউত) on 2006-08-01
    1. (Material Noun-Neuter) A small opening or materials removed from a solid object. গোটা বস্তুৰ পৰা এটা ক্ষুদ্ৰ অংশ আঁতৰালে হোৱা গাঁত।
    2. In optics, the aperture of an optical system (including a system consisting of a single lens) is the hole or opening that primarily limits light propagated through the system. The aperture defines a bundle of rays from each point on an object that will come to a focus in the image plane. An optical system typically has many structures that limit ray bundles (ray bundles are also known as pencils of light). These structures may be the edge of a lens or mirror, or a ring or other fixture that holds an optical element in place or may be a special element such as a diaphragm placed in the optical path to limit the light admitted by the system. These structures are called stops, and the aperture stop is the stop that primarily determines the cone of rays that an optical system accepts (see entrance pupil). As a result, it also determines the ray cone angle and brightness at the image point (see exit pupil). Optical systems are typically designed for a particular stop to be the aperture stop... from wikipedia.org