File:Optical_power_of_a_lens.svg · Wikimedia Commons · See Wikimedia Commons
دیوپتر
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thumb|Illustration of the relationship between optical power in dioptres and focal length in metres. A dioptre (British spelling) or ' (American spelling), symbol dpt or D', is a unit of measurement with dimension of reciprocal length, equivalent to one reciprocal metre, . It is normally used to express the optical power of a lens or curved mirror, which is a physical quantity equal to the reciprocal of the focal length, expressed in metres. For example, a 3-dioptre lens brings parallel rays of light to focus at metre. A flat window has an optical power of zero dioptres, as it does not cause l
A dioptre is a unit of measurement used to express the optical power of lenses and curved mirrors, defined as the reciprocal of the focal length measured in metres. It matters because it provides a simple way to describe how strongly a lens or mirror focuses or spreads light—for example, a 3-dioptre lens brings parallel light rays into sharp focus at one-third of a metre away.
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Key facts
- Unit.name
- dioptre
- Unit.quantity
- optical power
- Unit.symbol
- dpt
- Unit.symbol2
- D
- Unit.units1
- SI units
- Unit.inunits1
- 1 m−1
via Wikipedia infobox
Wikidata facts
Show 5 more facts
- measured physical quantity
- dioptric power
- described by source
- Armenian Soviet Encyclopedia
- unit symbol
- D
- conversion to SI unit
- 1
- P6512
- Wales
Sources (3)
via Wikidata · CC0