Lens-based telescope design in which a lens at the front of the tube directs light towards the rear of the tube.
Controlling light output by means of refraction (lens).
a prismatic glass element used to refract light
a telescope that takes advantage of the refraction of light through lenses to form images of objects
A telescope whose optics consist entirely of lenses.
A telescope that operates by bending (refracting) light into focus: a lens type telescope.
A telescope that uses as its primary optical element a lens. Binoculars are a type of refractor. In general, refractors are much more expensive to build and buy than are reflectors.
A device used to redirect the light output from a source, primarily by bending the waves of light.
A device that transmits and redirects the luminous flux from a source. Refractors for outdoor luminaires are typically made from acrylic, polycarbonate, or glass, and when designed well, help control direct glare.
A telescope that uses a transparent objective lens to refract, or bend, light in order to form an image at the focal plane.
A telescope whose objective is a lens.
A telescope that uses a lens to collect light.
A built in lens that bends the light rays to distribute the light over a wider area or to reduce glare.
A telescope, also known as a refracting telescope, that uses a transparent lens to gather light and bend it to a focus.