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Pellin-Broca prism

A form of dispersing prism, often used in monochromators, that consists of a common right-angle prism with a 30° dispersing prism attached to each of its square faces. The spectrum formed by the prism is the same as if the two 30° prisms were joined together to form a single 60° prism. The particular ray that would pass through the 60° prism in minimum deviation is turned through a right angle in the Pellin-Broca prism, for which reason the latter often is referred to as a constant deviation prism. When this prism is rotated about an axis parallel to the refracting edges, the spectrum moves laterally past the exit slit of a monochromator.
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