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Objective (optics)
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==Telescopes== [[File:KeckObservatory20071013.jpg|thumb|upright|The segmented hexagonal objective mirror of the [[W. M. Keck Observatory|Keck 2 Telescope]]]] In a telescope the objective is the lens at the front end of a [[refracting telescope]] (such as [[binoculars]] or [[telescopic sight]]s) or the image-forming [[primary mirror]] of a [[Reflecting telescope|reflecting]] or [[Catadioptric system#Catadioptric telescopes|catadioptric telescope]]. A telescope's light-gathering power and [[angular resolution]] are both directly related to the diameter (or "aperture") of its objective lens or mirror. The larger the objective, the brighter the objects will appear and the more detail it can resolve.
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