dioptre.英语音标
dioptre.英语音标 -
Dioptre \Di*op"tre\, n. [F. See 2d {Dioptric}.] (Optics)A unit employed by oculists in numbering glasses according to the metric system; a refractive power equal to that of a glass whose principal focal distance is one meter.
Dioptre \Di*op"tre\, n. [F. See 2d {Dioptric}.] (Optics)A unit employed by oculists in numbering glasses according to the metric system; a refractive power equal to that of a glass whose principal focal distance is one meter.
