Explain the types of Telescope.

Explanation

According to optical property, it is classified into two types.
(i) Refracting telescope.
(ii) Reflecting telescope : Lenses are used in this kind of telescopes. Galilean telescope, Keplerian telescope, Achromatic refractors, Apochromatic refractors are some Refracting telescope.
(ii) Reflecting telescope : Parabolic mirrors are used in these kind of telescopes . Gregorian , Newtonian , Cassegrain telescope, RitcheyChretien telescope are some Reflecting telescopes. According to the things which are observed, Astronomical Telescope adn Terrestrial Telescopes are the two major type of telescope.