A dove prism is used to invert an image and are a truncated right angle prism. A beam entering one of the sloped faces of a dove prism undergoes total internal reflections and exits the opposite face with a flipped orientation (top to bottom). A rotated dove prism will also change the state of polarization. Dove prisms are used in interferometry, astronomy, and pattern recognition. The name comes from it's inventor, Heinrich Wilhelm Dove.
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