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A **Keplerian telescope** consists of two converging lenses. Parallel rays from a very distant subject pass through the first lens, which has a large focal length, forming an image at the lens' focal point. This point merges with the object's focal point. The image is then magnified by the eyepiece lens, allowing it to be viewed under an enlarged angle. For clear viewing, the image produced by the objective lens must be located at the focus of the eyepiece. Because the object being observed is very distant, the image forms at the focal point of the objective lens. One characteristic of the Keplerian telescope is that the observed image is inverted, meaning the object appears upside down.
