<Table> <Tr> <Td> </Td> <Td> This section needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (May 2014) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This section needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (May 2014) (Learn how and when to remove this template message) </Td> </Tr> <P> The design Galileo Galilei used in 1609 is commonly called a Galilean telescope . It used a convergent (plano - convex) objective lens and a divergent (plano - concave) eyepiece lens (Galileo, 1610). A Galilean telescope, because the design has no intermediary focus, results in a non-inverted and upright image . </P> <P> Galileo's best telescope magnified objects about 30 times . Because of flaws in its design, such as the shape of the lens and the narrow field of view, the images were blurry and distorted . Despite these flaws, the telescope was still good enough for Galileo to explore the sky . The Galilean telescope could view the phases of Venus, and was able to see craters on the Moon and four moons orbiting Jupiter . </P>

The eye piece of the galilean telescope uses