Refractor Galileo

Telescope created in 1608 by the Dutch optician Hans Liberti, attracted the attention of Italian scientist Galileo Galilei. In a short time the scientist improved the design of Lipari by creating several pipes with improved characteristics. With their help, he made a number of discoveries, including mountains and valleys on the moon, four satellites of Jupiter.
The discoveries of Galileo has shown the importance of the telescope, and the type of instrument he used, became known as Galileo's telescope. Convex lens of the lens collected the light from the subject observed. And the concave eyepiece lens deflecting the light rays in such a way that they created an enlarged erect image. Lenses were installed in the pipes, one of which (smaller diameter) slipped inside the other. It is possible to adjust the distance between the lenses, while receiving a clear image.
Galileo's telescope works using the principle of refraction (deflection) of light, and therefore also known as a telescope-refractor. Another kind of telescope-refractor is characterized by a convexity of both lenses. This design creates enlarged but inverted image and is known as the astronomical telescope.