thanks dragon and ozzmosis, generally it is observed amongst the astronomy amatures that they don't have knowledge about telescope, its history, and lengths, and operation system, many starter or buyers of the telescope fails in viewing clear images through their telescope. Many tries with themselves, they don't go to observatories to see the planets and the sky. Most of them having a little telescope which result is so poor and they also not found satisfied. Yesterday one children ask me the same question that " if we see from a biggest telescope what will be the image's size? "
