Types Of Telescopes

There are three main optical types:
 
The refracting telescope which uses lenses to form an image.
The reflecting telescope which uses an arrangement of mirrors  to form an image.
The catadioptric telescope which uses mirrors combined with lenses to form an image.

There is also different types of telescope like:

    Radio telescopes
    X-ray telescopes
    Gamma-ray telescopes
    High-energy particle telescopes

 Those telescope mentioned above are used for studying different types of rays present in the universe. We dont use them for our satisfying purposes, only scientist present in NASA  uses it.

So, by now you came to know that which telescope we generally use, but still i would like to mention them are:

    The refracting telescope
    The reflecting telescope
    The catadioptric telescope

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