To understand the change in the use of telescopes, it is warranted that the evolution in types of telescopes be also investigated. An example of this is the Cassegrainian telescope, which is an evolution from the traditional Newtonian model, is a step towards the evolution in telescopes. The Cassegrainian telescope provides for easy adaption for mounting, thus providing easy angles to view the sky (Page and Page, 1966, p.35). The structure of the Cassegrainian telescope is as below
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