Telescopes

 
    The Astronomical Telescope vs. Galilean Telescope 

Astronomical 
The astronomical telescope has two lenses. Both are positive, as well as, they both play a huge part in the making of the telescope. The eyepiece works as a simple magnifier. The eyepice is used to view the object/image. The length of the eyepiece is equal to the sum of the focal lengths of the objective. The astronomical telescope can be used for terrestrial viewing. 

Galilean

The galilean telescope is a terristrial telescope aswell. It is shorter than the astronomical telescope but harnesses the same power. 

Both of these telescopes use different focal points and lenses. But both work similarly.