A telescope forms real and highly diminished image. The real image produced is inverted; i.e., the top and bottom are reversed. When an object is placed far from a convergent lens than the focal length, the lens produces an inverted, real and enlarged image, depending on how close the object is to the focal point. Telescopes are visual tools used in the field of astronomy that magnifies an image with the use of lenses and mirrors. There are two primary classifications of telescopes, refracting telescopes and reflecting telescopes.
- Refracting telescopes use lenses to collect and focus the light.
- One of the most common types of reflecting telescope is called a Newtonian reflector. Reflecting telescopes are used more and more in astronomy due to their ability to see much farther and much clearer.