A pentaprism is an optical device used primarily in cameras, especially single-lens reflex (SLR) cameras. It serves to invert and revert the image captured by the camera's lens so that when you look through the viewfinder, the image appears right-side up and correctly oriented, matching the way we perceive objects in reality. The pentaprism is made up of five polished surfaces, which allow light entering from the camera lens to be reflected within the prism before reaching the eyepiece.
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