diagonal l mirror 对角镜
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Newtonian and catadioptric telescopes have secondary (or diagonal) mirrors that obstruct a small percentage of light from the primary mirror.
牛顿望远镜和反射折射望远镜都有一个次级反射镜(或称斜反射镜),它们阻挡了一部分主反射镜的发射光。
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