#roof_prism
Roof prism
A roof prism, also called a Dachkanten prism or Dach prism, is a reflective prism containing a section where two faces meet at a 90° angle, resembling the roof of a building and thus the name. Reflection from the two 90° faces returns an image that is flipped laterally across the axis where the faces meet.
Sat 1st
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