( ( ( ( plano-convex ( lens shape ) ) , ) ( where ( ( ( ( one side ) ( is flat ) ) and ) ( ( the ( other ( convex plugtop ) ) ) cable-mounted ) ) ) ) ( plug . ) )
(ROOT (S (NP (NP (JJ plano-convex) (NN lens) (NN shape)) (, ,) (SBAR (WHADVP (WRB where)) (S (S (NP (CD one) (NN side)) (VP (VBZ is) (ADJP (JJ flat)))) (CC and) (S (NP (DT the) (JJ other) (NN convex) (NN plugtop)) (ADJP (JJ cable-mounted)))))) (VP (VBP plug)) (. .)))
plano-convex lens shape, where one side is flat and the other convex plugtop cable-mounted plug.
(ROOT (S (NP (NP (DT The) (NN lens)) (PP (IN of) (NP (DT the) (NN eye)))) (VP (VBZ is) (S (NP (DT a) (-LRB- -LRB-) (NN n) (-RRB- -RRB-) (NN convex)) (VP (VB shape)))) (. .)))