( ( ( ( The camera ) and ) ( ( ( the eye ) Both ) ( ( ( a camera ) and ) ( the eye ) ) ) ) ( ( have ( ( a ( convex lens ) ) ( which ( focuses ( ( the ( image upside-down ) ) ( on ( its detector ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN camera)) (CC and) (NP (NP (DT the) (NN eye)) (CC Both) (NP (NP (DT a) (NN camera)) (CC and) (NP (DT the) (NN eye))))) (VP (VBP have) (NP (NP (DT a) (NN convex) (NN lens)) (SBAR (WHNP (WDT which)) (S (VP (VBZ focuses) (NP (NP (DT the) (NN image) (NN upside-down)) (PP (IN on) (NP (PRP$ its) (NN detector))))))))) (. .)))
The camera and the eye Both a camera and the eye have a convex lens which focuses the image upside-down on its detector.
(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)))) (. .)))