( ( The ( final result ) ) ( ( is ( ( the deviation ) ( of ( ( the mirror-surface ) ( from ( the ( true ( optical surface ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ final) (NN result)) (VP (VBZ is) (NP (NP (DT the) (NN deviation)) (PP (IN of) (NP (NP (DT the) (NN mirror-surface)) (PP (IN from) (NP (DT the) (JJ true) (JJ optical) (NN surface))))))) (. .)))
The final result is the deviation of the mirror-surface from the true optical surface.
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (DT the) (NN water)) (VP (VBP vapor) (PP (IN from) (NP (DT a) (JJ hot) (NN shower) (NNS contacts))) (NP (NP (DT the) (JJR cooler) (NN surface)) (PP (IN of) (NP (DT a) (NN mirror))))))) (, ,) (NP (DT the) (NN result)) (VP (VBZ is) (SBAR (IN that) (S (NP (NNP foggy)) (VP (VBP mirror))))) (. .)))