EntityQ365859· pop 17ConcaveSign in to saveConcave or concavity may refer to:Article3 sectionsContentsScience and technologyMathematicsSee alsoConcave or concavity may refer to:==Science and technology== Concave lens Concave mirrorRead full article (4 paragraphs)ConnectionslensEntityconvex setEntitycurved mirrorEntityconcave functionEntitysecond derivativeEntityconcave polygonEntityCategoriesMathematics disambiguation pages