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For other uses, see Diopter (disambiguation). A dioptre (uk), or diopter (us), is a unit of measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal length measured in metres (that is, 1/metres). It is thus a unit of reciprocal length. For example, a 3-dioptre lens brings parallel rays of light to focus at 1â3 metre.
A reflecting telescope, aka reflector, or a refracting telescope, aka refractor, both use something called an objective, a lens or mirror that focuses light. The plane where the objective of a telescope forms (or focuses) an image is known as the focal plane, while the distance from a lens or mirror to its focal point is called the focal length of that lens or mirror.