| 单词 | pentaprism |
| 释义 | pentaprism /pen"teuh priz'euhm/, n. 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. Also, penta prism. [1935-40; PENTA- + PRISM] |
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