Reflecting Telescopes

Reflecting telescopes employ mirrors to collect light and focus it into the eyepiece. A concave main mirror serves the same purpose as the objective lens in a refractor. the main mirror lies at the bottom end of the tube. Light falling on it is reflected back up the tube to a smaller mirror, known as the secondary, which diverts the beam into an eyepiece at the side of the tube. the design is termed a Newtonian, after Isaac newton, who first devised it, and is the type most commonly used.

0 0

Post a comment