pentaprism-a prism that has five faces, a pair of which are at 90° to each other; a ray entering one of the pair emerges from the other at an angle of 90° to its original direction: used esp. in single-lens reflex cameras to reverse images laterally and reflect them to the viewfinder.
pixel-the smallest element of an image that can be individually processed in a video display system
overshadow-to cast a shadow
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