The pentagonal prism is a pentagonal prism with four polished surfaces, two of which are reflective surfaces, and the other two surfaces are the incident surface and the exit surface. The reflective surface of the pentagonal prism is coated with a dielectric reflective film. The pentagonal prism can turn the light by 90° with no image surface rotation or mirror reflection, and the 90° steering will not change due to the position of the prism, so it is very convenient for assembly. Widely used in level gauges and rangefinders, passport scanners, etc.

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