A delta prism is an optical element providing a compact folded form of the Dove prism. When used in the normal orientation, the prism inverts the image (that is, rotates it 180 degrees); rotating the orientation results in image rotation to other arbitrary angles. The base surface must be fabricated with a mirror coating to make it reflective. The other two surfaces are not coated, since they are internally reflective from the ray angles and high-index glass. The delta prism is named for its shape being similar to the uppercase Greek letter Δ (delta).
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