摘要
光束经凹透镜折射后发散,不能形成实像,因此不能直接测量凹透镜的焦距。在光具座上可借用凸透镜、平面镜、望远镜等辅助器件,以及视差法等4种方法测量凹透镜的焦距。
Light beams scatter through refraction of concave mirror, and can not form true image, hence we can not measure the focus of concave mirror directly. Such assistant apparatus of protruding mirror, plane mirror and telescope can be used , combined with parallax and other 3 methods to measure the focus of concave mirror.
出处
《唐山师范学院学报》
2001年第2期53-53,57,共2页
Journal of Tangshan Normal University
关键词
凹透镜
发散
焦距
测量
concave mirror
scattering
focus
