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Dioptrics
Dioptrics is the study of the refraction of light, especially by lenses. Telescopes that create their image with an objective that is a convex lens (refractors) are said to be "dioptric" telescopes.
An early study of dioptrics was conducted by Ptolemy in relationship to the human eye as well as refraction in media such as water. The understanding of the principles of dioptrics was further expanded by Alhazen, considered the father of modern optics.
==See also==
* Diopter/Dioptre (unit of measurement)
* Dioptrice (work by Johannes Kepler)
* Catoptrics (study and optical systems utilizing reflection)
* Catadioptrics (study and optical systems utilizing reflection and refraction)
* Optical telescope
* List of telescope types
* Image-forming optical system
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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