( This ( ( is ( ( the shape ) ( of ( a ( convex ( ( -LRB- ( or ( converging -RRB- ) ) ) lens ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT This)) (VP (VBZ is) (NP (NP (DT the) (NN shape)) (PP (IN of) (NP (DT a) (JJ convex) (PRN (-LRB- -LRB-) (CC or) (ADJP (JJ converging)) (-RRB- -RRB-)) (NN lens))))) (. .)))
This is the shape of a convex (or converging) lens.
(ROOT (S (NP (DT The) (ADJP (RBS most) (JJ common)) (JJ two-lens) (NN telescope)) (, ,) (PP (IN like) (NP (DT the) (JJ simple) (NN microscope))) (, ,) (VP (VBZ uses) (NP (NN convex) (NNS lenses))) (. .)))