Telescope :- A telescope is an optical instrument that produces large images of distant objects by providing angular magnification to enable observation of them. It works by collecting and focusing light through a combination of lenses and/or mirrors.
Many objects like stars, planets, galaxies are many times bigger than our Earth, but due to their extreme distance from the Earth, they appear small when seen with the naked eye. To gain more knowledge about their structure, we obtain their magnified images through a telescope.
Types of Telescope
Telescopes are based on both the principles of refraction and reflection of light and are of many types, but here we will read about two types of telescopes.
- Refracting Type Telescope :- A telescope based on refraction of light is called refracting type telescope. In a refracting type telescope, lenses are used to bend and focus light. Refracting type telescopes are used for both astronomical and terrestrial observations, hence they are further of two types:- (a) Astronomical refracting telescopes and (b) Terrestrial refracting telescopes.
- Reflecting Type Telescope :- A telescope based on reflection of light is called reflecting type telescope. Reflecting type telescopes use parabolic or spherical mirrors to bend and focus light.