An optical telescope is a telescope which is used to gather and focus light mainly from the visible part of the electromagnetic spectrum for directly viewing a magnified image for making a photograph, or collecting data through electronic image sensors.
There are three primary types of optical telescope: Refractors (Dioptrics) which use lenses, Reflectors (Catoptrics) which use mirrors, and Combined Lens-Mirror Systems (Catadioptrics) which use lenses and mirrors in combination; for example, the Maksutov telescope and the Schmidt camera.
A telescope's light gathering power is directly related to the diameter (or aperture) of the objective lens or mirror. The larger the lens is, the more light the telescope can collect. What is commonly described as a telescope's power, its magnification, is a function of both the objective's focal length and that of the eyepiece.
There are three primary types of optical telescope: Refractors (Dioptrics) which use lenses, Reflectors (Catoptrics) which use mirrors, and Combined Lens-Mirror Systems (Catadioptrics) which use lenses and mirrors in combination; for example, the Maksutov telescope and the Schmidt camera.
A telescope's light gathering power is directly related to the diameter (or aperture) of the objective lens or mirror. The larger the lens is, the more light the telescope can collect. What is commonly described as a telescope's power, its magnification, is a function of both the objective's focal length and that of the eyepiece.
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