What will be the nature of image obtained in astronomical telescope.

Draw the course of rays in an astronomical telescope, when the final image is formed at infinity. Also define the magnifying power of the astronomical telescope in this position.

What is the magnifying power of an astronomical telescope when the final image of a distant object is formed at least distance of distinct vision?

What is the magnifying power of an astronomical telescope in normal adjustment? What is its length?

Draw a labelled ray diagram to show the image formation in a refracting type astronomical telescope .Why should the diameter of teh objetive of a telescope large?