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.
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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