relay objective

• 换向物镜

relay objective的用法和样例：

例句

1. This objective produces only very little scattered light.
   此物镜仅产生很小的散射光。
2. In the same way, we can design the apochromatic photograph objective by different glasses.
   同理，选取不同的玻璃组合，也能设计出高质量的复消色摄影物镜。