ConcaveConcave means curving inward. eg. Concave mirror, Concave me... means curving inward.
eg. ConcaveConcave means curving inward. eg. Concave mirror, Concave me... mirror, ConcaveConcave means curving inward. eg. Concave mirror, Concave me... meniscusMeniscus is the curved upper surface of a non-turbulent liqu...
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