Optics. A unit of retinal illumination: = troland, n. Now rare.
| 单词 | θ80355 |
| 释义 | the world > matter > light > illumination > [noun] > unit of illumination > candela > troland (2) photon1916 Optics. A unit of retinal illumination: = troland, n. Now rare. troland1944 A unit of retinal illumination, being the illumination produced by a surface with a luminance of one candela per square metre when the pupil has… |
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