( ( ( The properties ) ( of ( the image ) ) ) ( formed ( by ( a ( plane mirror ) ) ) ) )
(ROOT (S (NP (NP (DT The) (NNS properties)) (PP (IN of) (NP (DT the) (NN image)))) (VP (VBD formed) (PP (IN by) (NP (DT a) (NN plane) (NN mirror))))))
The properties of the image formed by a plane mirror
(ROOT (S (NP (NNP Plane) (NNS mirrors)) (VP (VBP work) (SBAR (IN because) (S (NP (DT the) (JJ light) (NNS rays)) (VP (VBP create) (NP (NP (DT a) (JJ virtual) (NN image)) (PP (IN behind) (NP (DT the) (NN mirror)))))))) (. .)))