A telescope is an optical instrument used to make distance views and objects appear closer to the user.
To look at the sky...
The magnification, or power, at which a telescope is operating is a function of the focal length of the telescope's main (objective) lens (or primary mirror) and the focal length of the eyepiece employed.
Sprinklers
The Hubble Space Telescope has seen Earth. While its primary function is to observe celestial objects in deep space, the telescope has also been pointed towards Earth for calibration and testing purposes.
The function of a computerized telescopes is to view distant stars in the sky. The telescope can self align itself to specific stars once setup is complete.
One which doesn't use the visible light portion of the EM spectrum. For instance, a microwave telescope. A telescope would also be able to function regardless of weather conditions if it were in orbit, rather than ground-based.
It is a reflecting telescope
The nominal function of any telescope is to enlarge the image of a distant object and that is the same for reflecting or refracting or hybrid telescopes. That said, it is a better description of a telescope to say it is a light collector that brings into an image (on the eye or photo sensor of the user) the light that is given off by some distant object. The aperture of a telescope is much much larger than the aperture (iris) of the human eye, so whatever object is being viewed is producing light an a much greater quantity of light is entering the telescope than would be entering the eye. More light allows the image being viewed to be enlarged and still visible to the human eye.
Telescope eyepieces are important of any visual telescope. It is the main part of the telescope and is what determines how the object will look like through the telescope.
Telescope.
it is a reflector telescope
The Hubble Space Telescope has a number of instruments, but the primary one is an optical telescope.