Assertion: lens | /r/HasProperty | convex-concave
Facets:
Source sentences:
text: A lens with one convex and one concave side is convex-concave or meniscus.
text: A lens with one convex and one concave side is convex-concave or meniscus.
text: A lens with one convex and one concave side is convex-concave or meniscus.