( visible ( ( ( light ( ( the form ) ( of ( electromagnetic radiation ) ) ) ) ( that ( humans ( can ( see ( with ( their eyes ) ) ) ) ) ) ) . ) )
(ROOT (FRAG (ADJP (JJ visible)) (S (VP (VB light) (NP (NP (DT the) (NN form)) (PP (IN of) (NP (JJ electromagnetic) (NN radiation)))) (SBAR (IN that) (S (NP (NNS humans)) (VP (MD can) (VP (VB see) (PP (IN with) (NP (PRP$ their) (NNS eyes))))))))) (. .)))
visible light the form of electromagnetic radiation that humans can see with their eyes.
(ROOT (S (NP (PRP We)) (VP (VBP call) (NP (DT the) (JJ only) (NN light)) (SBAR (IN that) (S (NP (NNS people)) (VP (MD can) (VP (VB see) (NP (JJ visible) (NN light))))))) (. .)))