Penta prisms deviate an input beam by 270 degrees (-90 degrees) independently of the angle of incidence on the first surface. They are therefore useful as precise right angle mirrors which are insensitive to alignment. These penta prisms find many metrological applications.
Even if the angle of incidence to the prism changes, the light is always emitted at 90 degrees to the incident ray.
Using the internal reflection of the prism rather than two mirrors prevents angular misalignment and makes the entire system more compact.
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PPB-10-4 |
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Penta Prism /PPB-10-4
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PPB-15-4 |
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Penta Prism /PPB-15-4
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PPB-20-4 |
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Penta Prism /PPB-20-4
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PPB-25-4 |
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Penta Prism /PPB-25-4
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