optically flat surface

• 光学平面

optically flat surface的用法和样例：

例句

1. Flatness can be determined by covering a surface with an potically flat glass.
   用一光学平面玻璃覆盖一个表面，可以测量平整度。
2. In practice, two semisilvered or aluminized glass optical flats from the reflecting boundary surface.
   实际上，两块半镀银的或镀铝的光学平面玻璃构成了反射界面。