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**Keplerian telescope** is made up of two **converging lenses**. **Parallel rays** of a very distant subject pass through the lens with a **large focal lengths**, and an image is formed in the lens **focal point** (which merges with the object's focal point), and is observed again by the eyepiece under an enlarged viewing angle.
It is necessary for the image created by the lens to be in the **focus of the eyepiece**. The image created by the lens arises in its image focus because the object being observed is very far from the lens.
When using a Keplerian telescope, the object is being **turned upside down**.
