These have come to be called refractive telescopes, because the objective lens bends, or refracts, light.
(These; have come; to be called refractive telescopes, because the objective lens bends, or refracts) (These; to be called; refractive telescopes)
These These
have come to be called
to be called refractive telescopes, because the objective lens bends, or refracts
refractive telescopes