The greatest difference in magnifying power is between
a.
dissecting microscopes and compound light microscopes
b.
transmission electron microscopes and dissecting microscopes
c.
scanning electron microscopes and transmission electron microscopes
d.
compound light microscopes and scanning electron microscopes

After magnification of an object, it appears larger in size which is measured by magnifying power. It is determined by the formula

magnifying power =

where, = focal length of the scanning object.

and, = focal length of the eyepiece.

The greatest difference in magnifying power is between transmission electron microscopes and dissecting microscopes.

Therefore, the correct option among all the options that are mentioned in the question is the second option or option "b".