Radio Telescope
Radio Telescopes are extremely large as to be able to collect long radio waves. They can be used on Earth also it may, and most possibly will, make the picture fuzzy. They have the same types of antennas that are used for tracking and collecting data from satellites and space probes. These telescopes operate in the radio frequency portion of the electromagnetic spectrum where it is possible for them to detect and collect data on the sources. There appearance is typically a large, dish antenna which can be used singly or in an array. The observations made by these telescopes are preferentially located far from any major centres of population as to help avoid electromagnetic interference from radio, television, radar and other EMI emitting devices
Reflective Telescope
The Reflective Telescope is apart of the Optical Telescopes. They use a single or combination of different types of curved mirrors that will reflect light and then form an image. These telescopes were invented in the 17th century as an alternative to the refractive telescope. The design helps to allow extremely large diameter objectives. In Astronomy research almost all major telescopes are reflectors. They come in many different types of design variations and may even employ extra optical elements to help to improve image quality or place an image in a mechanically advantageous position. These telescopes are sometimes referred to as catoptric telescopes because they use mirrors.
Refractive Telescope
The Refractive Telescope is also apart of the Optical telescopes. It uses a single lens as its objective for it to form an image. They may also be referred to as a dioptric telescope. They were originally used in spy glasses and astronomical telescopes although they can also be used for long focus camera lenses. The large Refractive Telescope was extremely popular in the second half of the 19th Century although they have now been superseded for most research purposes by the Reflecting Telescope.