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.

Draw path of rays for astronomical telescope in normal adjustment.

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

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?

An astronomical telescope uses two lenses of power 10 D and 1 D.What is its magnifying power in normal adustment?

Draw a labelled diagram of an astronomical telescope and explain its working .Give an expressin for its magnifying power.

In a compound microscope,an object is placed at a distance of 1.5 cm from the objective of focal length 1.25 cm .If hthe eye-piece has a focal length of 5 cm and the final image is formed at the near point,estimate the magnifying power of the icroscope.