换向物镜

relay objective的用法和样例：

例句

This objective produces only very little scattered light.此物镜仅产生很小的散射光。
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。

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