Does the magnification equation change depending on whether the lens is a concave lens or a convex lens?

The figure below shows an object $AB$ placed on the principal axis of a convex lens placed in air. $F_{1}$ and $F_{2}$ are the two foci of the lens. Copy the diagram.
$(i)$ Draw a ray of light starting from $B$ and passing through $O$. Show the same ray after refraction by the lens.
$(ii)$ Draw another ray from $B$ which passes through $F_{2}$ after refraction by the lens.
$(iii)$ Locate the final image formed.
$(iv)$ Is the image real or virtual?

Write the relationship between object distance $(u)$,image distance $(v)$,and focal length $(f)$ for a spherical mirror.

If the magnification of a body of size $1\, m$ is $2$,what is the size of the image (in $m$)?

You are given a convex lens of focal length $10\, cm$. Where would you place an object to get a real,inverted and highly enlarged image of the object? Draw a ray diagram.

Where is the object placed to observe it through a compound microscope?