Glossary term: 透鏡
Description: 透鏡是一種光學設備，由於折射，它可以彎曲光線，使其匯聚或分散。透鏡通常由玻璃、塑料或其他透明材料製成。凸透鏡可以匯聚光線，將平行光束聚成一點。凹透鏡能分散平行光束，使其看起來像是從一個點發出的。
透鏡是折射望遠鏡和雙筒望遠鏡的主要部件。即使天文望遠鏡是反射望遠鏡（使用鏡子聚焦光線），望遠鏡上的照相機和攝譜儀也很可能使用一個或多個透鏡。
當一個大質量天體導致另一個背景天體的圖像產生光學畸變時，它就可以被稱為 "引力透鏡"。這種畸變是由於大質量前景天體的引力導致背景天體的光線彎曲造成的；這種現象被稱為引力透鏡效應。
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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
This is an automated transliteration of the simplified Chinese translation of this term
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