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penta prism

A five-sided prism containing two reflecting surfaces at 45° to each other, and two refracting faces perpendicular to the entering and emerging beams. The deviation angle of 90° is independent of any rotation of the prism about an axis parallel to the line of intersection of the two reflecting faces. It is commonly used as an end-mirror in a rangefinder and as an "optical square'' in surveying and alignment machinery.
 
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