( ( ( The grooves ) ( on ( a CD ) ) ) ( ( produce ( ( ( an ( effective ( ` ( diffraction ( grating ' ) ) ) ) ) , ) ( so ( reflected ( light ( produces ( ( ( a ( rainbow luminescence ) ) ( rather than ) ) ( a ( ( plain white ) light ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN grooves)) (PP (IN on) (NP (DT a) (NN CD)))) (VP (VBP produce) (NP (NP (DT an) (JJ effective) (`` `) (NN diffraction) (NN grating) ('' ')) (, ,) (SBAR (IN so) (S (VP (VBD reflected) (SBAR (S (NP (NN light)) (VP (VBZ produces) (NP (NP (DT a) (NN rainbow) (NN luminescence)) (CONJP (RB rather) (IN than)) (NP (DT a) (ADJP (RB plain) (JJ white)) (NN light))))))))))) (. .)))
The grooves on a CD produce an effective 'diffraction grating', so reflected light produces a rainbow luminescence rather than a plain white light.
(ROOT (S (NP (NNP Luminescence)) (VP (VBZ is) (NP (NP (DT the) (NN name)) (PP (IN of) (NP (NP (DT the) (NN process)) (SBAR (WHADVP (WRB where)) (S (NP (NN light)) (VP (VBZ is) (VP (VBN produced) (PP (IN without) (NP (NN heat))))))))))) (. .)))