If one of these light source rays hits a refractive object, it may no longer be headed for the light source once the refraction is done.
(one of these light source rays; hits; a refractive object) (it; may be headed; for the light source; T:once the refraction is done; T:no longer) (the refraction; is done; )
one of these light source rays it the refraction
hits may be headed is done
a refractive object
for the light source T:once the refraction is done T:no longer