( ( Images ( formed ( by ( plane mirrors ) ) ) ) ( ( are ( ( ( virtual ( , ( upright ( , ( left-right ( reversed , ) ) ) ) ) ) ( the ( same distance ) ) ) ( from ( ( the mirror ) ( as ( ( ( ( ( the ( object 's ) ) distance ) , ) and ) ( ( the ( same size ) ) ( as ( the object ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNS Images)) (VP (VBN formed) (PP (IN by) (NP (NN plane) (NNS mirrors))))) (VP (VBP are) (NP (NP (ADJP (JJ virtual) (, ,) (JJ upright) (, ,) (IN left-right) (JJ reversed) (, ,)) (DT the) (JJ same) (NN distance)) (PP (IN from) (NP (NP (DT the) (NN mirror)) (PP (IN as) (NP (NP (NP (DT the) (NN object) (POS 's)) (NN distance)) (, ,) (CC and) (NP (NP (DT the) (JJ same) (NN size)) (PP (IN as) (NP (DT the) (NN object)))))))))) (. .)))
Images formed by plane mirrors are virtual, upright, left-right reversed, the same distance from the mirror as the object's distance, and the same size as the object.
(ROOT (S (NP (DT A) (NN plane) (NN mirror)) (VP (VP (VBZ has) (NP (DT a) (ADJP (JJ flat) (JJ reflective)) (NN surface))) (CC and) (VP (VBZ forms) (NP (RB only) (JJ virtual) (NNS images)))) (. .)))