( ( ( The ( focal length ) ) ( for ( light ( at ( other ( visible wavelengths ) ) ) ) ) ) ( ( will ( ( ( ( be similar ) but ) not ) ( exactly ( equal ( to this ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ focal) (NN length)) (PP (IN for) (NP (NP (NN light)) (PP (IN at) (NP (JJ other) (JJ visible) (NNS wavelengths)))))) (VP (MD will) (VP (VP (VB be) (ADJP (JJ similar))) (CC but) (RB not) (VP (ADVP (RB exactly)) (JJ equal) (PP (TO to) (NP (DT this)))))) (. .)))
The focal length for light at other visible wavelengths will be similar but not exactly equal to this.
(ROOT (S (NP (JJ Exact) (NN wavelength)) (VP (VBZ determines) (NP (NP (DT the) (NN color)) (PP (IN of) (NP (JJ visible) (NN light))))) (. .)))