Design a telescope using a three lens system

Question

Design a telescope using a three lens system. Include a diagram that shows the lens' relative location, focal length and the ray diagrams that create the image that you see by looking into the telescope at an object (located at a distance of your choice).

Include an explanation that describes why you placed the lens' in the location that you did relative to each other.

Calculate the size of the image that you would see if you were to use the telescope to observe a large cat that is a specific distance from the objective lens. 

Answer 1

Two convex lenses are used in Astronomical telescope which gives highly magnified inverted image. However, a third field convex lens of suitable radius of curvature is used between two lenses to erects the inverted image. In this way we can use the telescope to see the distant objects on the surface of Earth.