EntityQ3410566· pop 35· linked from 128 articlesoptical axisSign in to saveline along which there is some degree of rotational symmetry in an optical systemConnectionsphysicsEntitymirrorEntitymicroscopeEntityopticsEntitylensEntityoptical fiberEntityUnited States Department of DefenseConceptcamera lensEntityrayEntityscope sightEntityrotational symmetryEntitycardinal pointEntityoptic axis of a crystalEntityGeneral Services AdministrationEntitycopyright status of works by the federal government of the United StatesEntitycoreEntityoff-axis optical systemEntityCategoriesGeometrical optics