( ( In ( ( the field ) ( of optics ) ) ) ( , ( Fermat ( ( ( s ( Principle states ) ) ( that ( light ( travels ( between ( ( two points ) ( in ( the ( quickest ( time possible ) ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (NP (DT the) (NN field)) (PP (IN of) (NP (NNS optics))))) (, ,) (NP (NNP Fermat)) (VP (VBZ s) (NP (JJ Principle) (NNS states)) (SBAR (IN that) (S (NP (NN light)) (VP (VBZ travels) (PP (IN between) (NP (NP (CD two) (NNS points)) (PP (IN in) (NP (DT the) (JJS quickest) (NN time) (JJ possible))))))))) (. .)))
In the field of optics, Fermat s Principle states that light travels between two points in the quickest time possible.
(ROOT (S (NP (NP (NNP Fermat) (POS 's)) (NN principle)) (VP (VBZ states) (SBAR (IN that) (S (NP (NN light)) (VP (MD will) (ADVP (RB always)) (VP (VB take) (NP (NP (DT the) (NN path)) (PP (IN of) (NP (NP (DT the) (JJS least) (NN amount)) (PP (IN of) (NP (NN time))))))))))) (. .)))