User:Paul Pot/Pechan prism

User:Paul_Pot

An Pechan prism, named for its inventor Pechan, is a type of reflecting prism used to flip the image vertically. A variation of the Pechan prism is the Schmidt-Pechan prism, which replaces one reflective face with a roof section. Thus the Schmidt-Pechan roof prisms flips the image both vertically and horizontally,.

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