| 单词 |
beam diameter |
| 释义 |
DictionarySeebeam widthbeam diameter
beam diameter[′bēm dī‚am·əd·ər] (optics) The distance between points on opposite sides of a light beam at which the power per unit area drops to 1/ e (0.37) times its maximum value. |
| 随便看 |
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