How did the astronomical telescope see the principle that made it so far away?

1, production principle: astronomical telescope generally has two lens barrels, the largest of which is the main mirror, which is used to observe the target; The small one is called an image finder, which is used to find the target. It is also called a sight. The eyepiece is an individual and determines the magnification. There will be an f value on the eyepiece, which is the focal length of the eyepiece. Divide the f value of the primary mirror by the f value of the currently used eyepiece, which is the current magnification. Remember, magnification is the standard. The limit magnification of a telescope with a diameter of 6 cm is about 120 times, and the maximum magnification of 8 cm is about 160 times.

2. Astronomical telescope can gather more light and see darker celestial bodies because of the large pupil diameter of aperture ratio's naked eye. Obviously, the farther away an object with the same brightness is, the darker its brightness is, so the telescope can see relatively distant objects. However, it does not mean that all celestial bodies can be seen in this range. For example, M87, which is tens of millions of light years away, looked at it with an astronomical telescope for a whole day, but it doesn't mean that it saw dwarf galaxies and stars closer to him.