( ( A ( Galilean telescope ) ) ( ( is ( defined ( as ( having ( ( ( one ( convex lens ) ) and ) ( one ( concave lens ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NNP Galilean) (NN telescope)) (VP (VBZ is) (VP (VBN defined) (PP (IN as) (S (VP (VBG having) (NP (NP (CD one) (NN convex) (NN lens)) (CC and) (NP (CD one) (JJ concave) (NN lens)))))))) (. .)))
A Galilean telescope is defined as having one convex lens and one concave 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))) (. .)))