描述: 在反射式望远镜（或称镜面望远镜）中，主要的光学元件是一面反射镜，即“主镜”，它的作用是收集入射光。反射式望远镜通常以主镜直径为特征参数，从较小的业余望远镜的10厘米到专业望远镜中使用的最大实体镜的 8 米不等。将多个反射镜组合在一起，可以获得更大的集光面积，其作用相当于较大的实体镜。反射式望远镜有多种类型。例如，在牛顿式望远镜中，来自主镜的光线被一个较小的平面镜侧向反射到目镜或照相机中。在卡塞格林式望远镜中，较小的凸面副镜通过主镜上的开口将光线反射回去。

相关词条

• 折射式望远镜
• 望远镜
• 反射镜

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