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rhomboid prism

A reflecting prism that is rhomboidal in shape. It has two parallel transmitting faces, and two parallel reflecting faces; the latter are oblique to the former (usually but not necessarily at 45°). This prism is capable of offsetting the optical axis without changing the aspect of the image. If the rhomboid prism is rotated around an axis normal to the entrance surface, the offset emergent axis can be moved parallel to itself in a circular arc; hence pairs of these prisms often are used to provide interpupillary adjustment of the eyepiece of binocular instruments such as stereoscopic rangefinders and heightfinders.
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