In geometry, a triangle prism is a three-sided prism; it is a polyhedron made of a triangular base, a translated copy, and 3 faces joining corresponding sides.
Equivalently, it is a pentahedron of which two faces are parallel, while the surface normals of the other three are in the same plane (which is not necessarily parallel to the base planes). These three faces are parallelograms. All cross-sections parallel to the base faces are the same triangle.

指标：

• 材料：BK7玻璃
  

• 尺寸公差：+0.0,-0.2mm
  

• 有效孔径>85%
  

• 光洁度：40-20 S/D
  

• 面形：λ/8@632.8nm
  

• 平行度：1分
  

• 镀膜：R<0.2%@中心波长
  

• 倒角：0.2mm x 45°