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dioptre

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Definitions of dioptre in various dictionaries:

noun - a unit of measurement of the refractive power of a lens which is equal to the reciprocal of the focal length measured in meters

adj - a measure of refractive power [n -S] : DIOPTRAL

DIOPTRE - A dioptre (British spelling) or diopter (American spelling) is a unit of measurement of the optical power of a lens or curved mirror, which is equal ...

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Possible Dictionary Clues
Alternative spelling of diopter.
a unit of refractive power, which is equal to the reciprocal of the focal length (in metres) of a given lens.
a unit of measurement of the power of a lens, used for measuring a person's eyesight:
A unit of refractive power, which is equal to the reciprocal of the focal length (in metres) of a given lens.

Dioptre description
A dioptre (British spelling) or diopter (American spelling) 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. (1 dioptre = 1 m1.) It is thus a unit of reciprocal length. For example, a 3-dioptre lens brings parallel rays of light to focus at 13 metre. A flat window has an optical power of zero dioptres, and does not cause light to converge or diverge. * Dioptres are also sometimes used for other reciprocals of distance, particularly radii of curvature and the vergence of optical beams. The usage was proposed by French ophthalmologist Ferdinand Monoyer in 1872, based on earlier use of the term dioptrice by Johannes Kepler.The main benefit of using optical power rather than focal length is that the lensmaker's equation has the object distance, image distance, and focal length all as reciprocals. A further benefit is that when relatively thin lenses are placed close together their powers approxi

Dioptre description

A dioptre (British spelling) or diopter (American spelling) 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. (1 dioptre = 1 m1.) It is thus a unit of reciprocal length. For example, a 3-dioptre lens brings parallel rays of light to focus at 13 metre. A flat window has an optical power of zero dioptres, and does not cause light to converge or diverge.
* Dioptres are also sometimes used for other reciprocals of distance, particularly radii of curvature and the vergence of optical beams. The usage was proposed by French ophthalmologist Ferdinand Monoyer in 1872, based on earlier use of the term dioptrice by Johannes Kepler.The main benefit of using optical power rather than focal length is that the lensmaker's equation has the object distance, image distance, and focal length all as reciprocals. A further benefit is that when relatively thin lenses are placed close together their powers approxi

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