副ふく鏡きょう

noun

secondary mirror

Technical term in astronomy for the small mirror in a reflecting telescope that redirects light from the primary mirror to the eyepiece or detector.

• 反はん射しゃ望ぼう遠えん鏡きょうでは、副ふく鏡きょうが光ひかりを接せつ眼がんレンズに導みちびく。

  In a reflecting telescope, the secondary mirror guides the light to the eyepiece.