( ( Selective filter ) ( ( are ( ( used primarily ) ( ( ( to ( remove ( ( short ( wavelength light ) ) ( that ( ( scatters ( more easily ) ) ( than ( long ( wavelength light ) ) ) ) ) ) ) ) and ) ( to ( ( remove ( ultraviolet light ) ) ( ( that with ) ( ( some pathologies ) ( can ( produce ( fluorescence ( of ( the media ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Selective) (NN filter)) (VP (VBP are) (VP (VBN used) (ADVP (RB primarily)) (S (VP (VP (TO to) (VP (VB remove) (NP (NP (JJ short) (NN wavelength) (NN light)) (SBAR (WHNP (WDT that)) (S (VP (VBZ scatters) (ADVP (RBR more) (RB easily)) (PP (IN than) (NP (JJ long) (NN wavelength) (NN light))))))))) (CC and) (VP (TO to) (VP (VB remove) (NP (JJ ultraviolet) (NN light)) (SBAR (IN that) (IN with) (S (NP (DT some) (NNS pathologies)) (VP (MD can) (VP (VB produce) (NP (NP (NN fluorescence)) (PP (IN of) (NP (DT the) (NNS media)))))))))))))) (. .)))
Selective filter are used primarily to remove short wavelength light that scatters more easily than long wavelength light and to remove ultraviolet light that with some pathologies can produce fluorescence of the media.
(ROOT (S (NP (DT The) (JJ light-producing) (NN process) (NN fluorescence)) (VP (VBZ occurs) (SBAR (WHADVP (WRB when)) (S (NP (DT a) (NN substance)) (VP (VP (VBZ absorbs) (NP (JJ shorter-wavelength) (JJ ultraviolet) (NN light))) (CC and) (VP (ADVP (RB then)) (VBZ gives) (PRT (RP off)) (NP (NP (DT the) (NN energy)) (PP (IN as) (NP (JJ visible) (NN light))))))))) (. .)))