How can you calculate the magnification of a microscope?

Magnification of a microscope is calculated by multiplication of the power of objective lens and power of eyepiece lens.

{Magnification of object= Magnifying power of objective lens X Magnifying power of eyepiece lens.}

For example: If the magnifying power of the eyepiece lens is 10X and the magnifying power of objective lens is 4X, the magnification is 40X.