Telescopes are the tools of the astronomers to study the unverse. The instruments such as spectrographs, CCD detectors and Photometers make telescopes powerful analyzing tool.
Electromagnetic waves cover a wide range of radiations, starting from radio waves to gamma rays.
The variety of radiations have the same physical properties as wave and differ only in wavelength or frequency. Understanding the basic properties of light as in wave and particle behaviors. Telescopes are designed for different types of radiations. They perform certain tasks most efficiently. Each design has certain advantages and limitations.