Hoe does magnifying power change with change in length of tube for a given microscope ?

How does magnifying power change with change in length of tube for a given telescope ?

How does magnifying power change with change in length of tube for a given telescope ?

Write the formula for magnifying power and length of tube of an astronomical telescope.

A convex lens of focal length 5cm is used as a simple microscope. What is the magnifying power, if final image is formed at the distance of distinct vision i.e. 25 cm ? If it is used as an eyepiece in a compound microscope with objective of magnifying power 40, what is the magnifying power of the compound microscope ?

How does magnifying power of a telescope change on decreasing the aperture of its objective lens?Justify your answer.