( ( Its ( field lens ) ) ( ( consists ( of ( ( a ( cemented triplet ) ) ( matched ( to ( a ( single ( plano-convex ( eye lens ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP$ Its) (NN field) (NN lens)) (VP (VBZ consists) (PP (IN of) (NP (NP (DT a) (JJ cemented) (NN triplet)) (VP (VBN matched) (PP (TO to) (NP (DT a) (JJ single) (JJ plano-convex) (NN eye) (NN lens))))))) (. .)))
Its field lens consists of a cemented triplet matched to a single plano-convex eye lens.
(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)))) (. .)))