How does optical scope achieve the goal of magnification?
Most of the optical scopes are based on the Kepler remote system,, which consists of a convex lens for the objective lens, two lenses just as the center lens, reticle wire, two eyepiece. The image it makes is upside down just after the lens. Then through the eyepiece into the human eye into a positive image. The use of Kepler telephoto system can clearly see the details of the object, increase the distance from the human eye to observe the ability of long-range goals. And this telescopic system easier to set reticle!