Keywords:  telescope, lenses, focus, lens, focuses
A telescope which uses lenses to gather and focus light.
A telescope that uses lenses to bring light to a focus.
A telescope that uses a clear (glass) objective to refract, or bend, the light to form an image at the focal plane. Binoculars are really just two small refracting telescopes. Small astronomical refractors are common, but larger ones (4"+) can get very expensive.