Glossary term: 反射鏡
Description: 反射鏡是一種從其表面反射光線的光學設備。凸面鏡能使光束髮散，而凹面鏡則能使光束會聚。凹面鏡可以經過塑形，從而使平行光束聚焦到一點。大多數現代望遠鏡都使用大型凹面鏡作為主要集光區。
天文望遠鏡中使用的大多數反射鏡的主體都是由玻璃製成的。鏡體有時使用的其他材料包括陶瓷和金屬。鏡體需要經過研磨（或塑形）並拋光，如果材料本身不具有反射性，則會在表面塗上一層薄薄的金屬塗層。鋁是最常見的塗層材料，而金或銀也是可選擇的塗層材料。
對於直徑超過6米的望遠鏡來說，鑄造並支撐如此巨大的玻璃反射鏡非常困難。因此，如今世界上最大的一些望遠鏡使用了許多較小的反射鏡，這些反射鏡排列在一起，就像一面巨大的反射鏡一樣聚焦光線。
Related Terms:
See this term in other languages
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
The OAE Multilingual Glossary is a project of the IAU Office of Astronomy for Education (OAE) in collaboration with the IAU Office of Astronomy Outreach (OAO). The terms and definitions were chosen, written and reviewed by a collective effort from the OAE, the OAE Centers and Nodes, the OAE National Astronomy Education Coordinators (NAECs) and other volunteers. You can find a full list of credits here. All glossary terms and their definitions are released under a Creative Commons CC BY-4.0 license and should be credited to "IAU OAE".
If you notice a factual or translation error in this glossary term or definition then please get in touch.
