Glossary term: 透镜
Description: 透镜是一种光学设备，由于折射，它可以弯曲光线，使其汇聚或分散。透镜通常由玻璃、塑料或其他透明材料制成。凸透镜可以汇聚光线，将平行光束聚成一点。凹透镜能分散平行光束，使其看起来像是从一个点发出的。
透镜是折射望远镜和双筒望远镜的主要部件。即使天文望远镜是反射望远镜（使用镜子聚焦光线），望远镜上的照相机和摄谱仪也很可能使用一个或多个透镜。
当一个大质量天体导致另一个背景天体的图像产生光学畸变时，它就可以被称为 "引力透镜"。这种畸变是由于大质量前景天体的引力导致背景天体的光线弯曲造成的；这种现象被称为引力透镜效应。
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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher The translation of this term and its definition is still awaiting approval
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