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aperture
The diameter of the main mirror in a reflecting telescope, the objective lens in a refracting telescope, or the dish of a radio telescope. The larger the aperture, the greater the ability to collect light and detect faint objects, and the greater the resolving power. In the case of amateur telescopes, a rough guide for estimating the magnification that an aperture can handle well is 2× per mm, or 50× per inch.
Related category
• OBSERVATIONAL ASTRONOMY
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