English translation for "optical range"

光测距，直观距离
光强见距
光射距
光视距
光学距离
视线距离
直视距离

Example Sentences:

1.

For some of those x ray sources , no visible counterparts can be seen in optical range 当中一些x射线源，用光学望远镜竟无法看见它们对应的物体。

Similar Words：

"optical radiation" English translation, "optical radiation comparator" English translation, "optical radio communication" English translation, "optical radome" English translation, "optical radome absorption" English translation, "optical range finder" English translation, "optical range finding technique" English translation, "optical range gating" English translation, "optical rangefinder" English translation, "optical ranger" English translation