双凹球面镜
双凹透镜是由两个凹球面组成，有一个负焦距长，最适用于发散一个会聚光束，类似于一个平凹镜，一个双凹透镜能够发散一个准直射光束到一个个虚焦点，就像光束扩展器。
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双凹球面镜 | 双凹透镜是由两个凹球面组成，有一个负焦距长，最适用于发散一个会聚光束，类似于一个平凹镜，一个双凹透镜能够发散一个准直射光束到一个个虚焦点，就像光束扩展器。 |
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