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 least distance of distinct vision?

What is meant by least distance of distinct vision?

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

A small telescope has an objective lens of focal length 140cm and an eyepiece of focal length 5.0cm. What is the magnifying power of the telescope for viewing distant objects when- the final image is formed at the least distance of distinct vision (25cm)?