noun🔗ShareA reflective optical prism containing a section where two faces meet at a 90° angle, resembling the roof of a building. Reflection from the two 90° faces returns an image that is flipped laterally across the axis where the faces meet."The binoculars used for birdwatching contain roof prisms to correct the image and make it appear right-side up. "technologyphysicsdeviceChat with AIVocabulary GamePractice Reading
