diopter

Definitions

  • WordNet 3.6
    • n diopter a unit of measurement of the refractive power of a lens which is equal to the reciprocal of the focal length measured in meters; used by oculists
    • ***
Webster's Revised Unabridged Dictionary
    • n Diopter An optical instrument, invented by Hipparchus, for taking altitudes, leveling, etc.
    • ***
Century Dictionary and Cyclopedia
    • n diopter An ancient form of theodolite.
    • n diopter The alidade or index arm of a graduated circle.
    • n diopter An instrument used in craniometry for obtaining projections of the skull.
    • n diopter A dioptric.
    • ***
Chambers's Twentieth Century Dictionary
    • ns Diopter an ancient form of theodolite: the index-arm of a graduated circle
    • ***

Etymology

Webster's Revised Unabridged Dictionary
L. dioptra, fr. Gr. . See 2d Dioptric
Chambers's Twentieth Century Dictionary
Gr. dia, through, opt-, as in opsesthai, to see, &c.

Usage

In literature:

DIOPTER, the unit in terms of which the power of a lens or curved mirror can be expressed.
"The New Gresham Encyclopedia" by Various
***

In news:

Three-diopter optical quality glass magnifying lens.
Magid Gemstone Myst Flex Y19CFC reader-style safety spectacles are available in 5 magnification levels from a 1.0 to 3.0 diopter.
BUY THE 90 and 20 (28 if you're short) diopter condensing lenses.
In our own field we generally understand the jargon and do not give a second thought when we write down such terms as "angular magnification" or "diopter.".
***

In science:

For instance, one can write (68) and (72) when a light beam is reflected and refracted in a diopter between regions I-I I and I I-I I I.
Dirac Fermions in Inhomogeneous Magnetic Field
I-I I and I I-I I I behaves like a non-reflective diopter, namely there is a total transmission.
Dirac Fermions in Inhomogeneous Magnetic Field
Different cases are treated, which concerned total reflecting and transmitting beams where they are interpreted as mirror or diopter systems.
Dirac Fermions in Inhomogeneous Magnetic Field
***