Draw a ray diagram of compound microscope for the final image formed at least distance of distinct vision?

Draw the ray diagram of acompound microscope.

What is least distance of distinct vision?

With the help of labelled diagram, give the principle and magnifying power of compound microscope, when final image is formed at least distance of distinct vision.

With the help of ray diagram, describe the constru¬ ction, working of acompound microscope when the final image is formed at least distance of distinct vision (D = 25 cm). Derive an expression for its magnifying power (m)

What is meant by least distance of distinct vision?