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Penta Prisms

Penta prism is a five sided prism used to deviate the input beam by 90° and will neither invert nor reverse the image. The two reflecting surfaces are coated with antireflective material to reduce the loss of light (through transmission) as the incident angle is less than the critical angle. It is widely used in laser level, alignment and optical tooling.These prisms deviate a beam through the same angle regardless of its orientation to the beam. This makes penta prisms valuable for applications requiring an exact 90° deviation without having to orient the prism precisely. The monolithic design of a penta prism also makes it inherently more stable than a system consisting of two mirrors.
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