Magnification power of the microscope is the degree of image enlargement. It depends upon the following:

i. Length of optical tube
ii. Magnifying power of objective
iii. Magnifying power of eyepiece 

With a fixed tube length of 160 mm in majority of standard microscopes, the magnification power of the microscope is obtained by the following:

Magnifying power of objective × Magnifying power of eye piece.

Resolving power represents the capacity of the optical system to produce separate images of objects very close to each other.

                  Resolving power (R) : 0.61 λ / NA

where λ is wavelength of incidental light; and NA is numerical aperture of lens Resolving power of a standard light microscope is around 200 nm. 

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