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en.wikipedia.org/wiki/Refracting_telescope

A refracting telescope (also called a refractor) is a type of optical telescope that uses a lens as its objective to form an image The refracting telescope design was  ...

lco.global/spacebook/refracting-telescopes

How Refraction WorksLight travels through a vacuum at its maximum speed of about 3.0 × 108 m/s, and in a straight path. Light travels at slower speeds through  ...

www.astronomynotes.com/telescop/s2.htm

Jan 7, 2011 ... The part of the telescope that gathers the light, called the objective, determines the type of telescope. A refractor telescope uses a glass lens as ...

www.telescope.com/Telescopes/Refractor-Telescopes/pc/1/10.uts

This refractor telescope goes the extra distance in introducing the novice to the wonders of the night sky. The Observer II 70 refractor features a 70mm-aperture ...

www.pas.rochester.edu/~blackman/ast104/refracting.html

Optical telescopes may be divided into two general categories: (1) refracting telescopes that use lenses to gather and focus light, and (2) reflecting telescopes  ...

www.britannica.com/science/refracting-telescope

Commonly known as refractors, telescopes of this kind are typically used to examine the Moon, other objects of the solar system such as Jupiter and Mars, and ...

ecuip.lib.uchicago.edu/multiwavelength-astronomy/optical/history/03.html

His telescope was a big hit in Padua and Venice, and the Paduan Senate gave him 1000 florins per year and a professorship for the invention, which could be ...

amazing-space.stsci.edu/resources/explorations/groundup/lesson/basics/g8a

Galileo's refractor used two lenses to concentrate the light from celestial objects, delivering more light to the human eye than it can gather on its own. The light ...

amazing-space.stsci.edu/resources/explorations/groundup/lesson/scopes/galileo/index.php

Galileo wasn't the first to build the device that would become known as the telescope, but he seems to have been the first to use it to study the heavens. In 1608 ...