定义：

可以用来倒像的特殊形状的屋脊棱镜。由于是垂直端面，它可以插入物体和望远镜目镜之间。如果屋脊由一个平面代替，它就成为还原棱镜，或称K棱镜。

English Expression：

Abbe prism

Definition:

A particular form of roof prism that can be used to invert an image. Because of the perpendicular end faces, it can be inserted between the objective and eyepiece of a telescope. If the roof is replaced by a plane surface, it becomes a reversion, or K, prism.

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