| 单词 | optical flat |
| 释义 | optical flat A flat glass disc having very accurately polished surfaces so that the deviation from the perfect flatness does not exceed (usually) 50 nanometres. It is used to test the flatness of such plane surfaces as gauge anvils by means of the interference patterns formed when parallel beams of light pass through the flat and are reflected by the surface being inspected. Surfaces are said to be optically flat if the deviation from perfect flatness is smaller than the wavelength of light |
| 随便看 |
|
物理辞典收录了3346条物理词条，基本涵盖了常用物理知识及物理英语单词词组的翻译及用法，是物理学习的有利工具。