Penta Prisms deflect light by 90° via two internal reflections, preserving image orientation. Used in rangefinders and viewfinders for stable field alignment.
Penta Prism can deviate an incident beam without inverting or reversing to 90°. 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 in Plumb Level, Surveying, Alignment, Rangefinding and Optical Tooling.
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