What is the least distance of distinct vision?

What should be the position of an object relative to a biconvex lens so that it behaves like a magnifying glass?

What is the angular magnification produced by a single convex lens used as a simple microscope in ‘normal’ use?

An object is seen first in red light and then in violet light through a simple microscope. In which case will the magnifying power be larger?

What steps are taken to obtain a high angular magnification from a compound microscope?

A distant object is being seen through a telescope. If a fly sits on the objective, what will be its effect on the image of the object?

Why is the power of the objective lens of a telescope is kept as small as possible?