Diopter

[dai'ɔptә(r)]

解釋/意思:

(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; used by oculists.

布兰得利整理--From WordNet

解釋/意思:

(n.) Alt. of Dioptra

手打:诺娜