Telescopes

Telescopes.. The telescope was designed so that one could view objects using electromagnetic radiation. Telescopes were invented in the early 17th century in the netherlands. Tele and scope is a greek word and means 'far' and 'To see'

The idea that a mirror could be used as an objective instead of a lens was being investigated soon after the invention of the refracting telescope

in 1688 Issac Newton invented the first practical reflecting telescope that he called the newtonian reflector, (cough) cocky.

there are four types of telescopes Optical Radio X-Ray and Gamma-Ray Telescope each with individual performances this is a diagram of a diagram of the electromagnetic spectrum with the Earth's atmospheric transmittance (or opacity) and the types of telescopes used to image parts of the spectrum.