The earliest known telescope appeared in 1608 in the Netherlands when an eyeglass maker named Hans L [...]
The earliest known telescope appeared in 1608 in the Netherlands when an eyeglass maker named Hans Lippershey tried to obtain a patent on one. Although Lippershey did not receive his patent, news of the invention soon spread across Europe. The design of these early refracting telescopes consisted of a convex objective lens and a concave eyepiece. Improved Galileo on this design The Following year and applied it to astronomy. In 1611, Johannes Kepler Described how has far more telescope Could Be Useful made with a objective lens and eyepiece lens convex to convex. By 1655, astronomers such as Christiaan Huygens were building powerful but unwieldy Keplerian telescopes with compound eyepieces.