Hall circles are a concept used in geometry and optics, particularly in the study of optical systems and the analysis of light rays and their behavior in mirrors and lenses. They are often associated with the analysis of reflective surfaces and can help in understanding the relationship between the object, image, and the optical system in use. The term "Hall circle" may also refer to specific circles or loci associated with optical elements that help in visualizing the paths of light rays and their intersections.
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