副镜（Secondary mirror），星光射向反射式望远镜经主镜反射后遇到的第二块反射镜。其直径一般比主镜要校。
副镜在磨制和抛光过程中必须与此新形状相适应。
The secondary mirror must be adapted during the process of grinding and polishing to this other form .
镜4只是一块平面镜，就象牛顿式望远镜的副镜一样，方便观测。
Mirror 4 is just a flat mirror like Newtonian telescope's secondary mirror, to give convenience for eyes.
随着科学相机和摄谱仪低温试验的完成以及最后飞行镜片(副镜)的安装，NASA的詹姆斯·韦伯太空望远镜最近进一步接近了发射。
NASA's James Webb Space Telescope just got a little closer to launch with the completion of cryogenic testing on its science cameras and spectrographs and the installation of the final flight mirrors.
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