Editing Magnification (section)

===Microscope===
The angular magnification of a [[microscope]] is given by

<math display="block">M_\mathrm{A} = M_\mathrm{o} \times M_\mathrm{e}</math>

where <math display="inline">M_\mathrm{o}</math> is the magnification of the objective and <math display="inline">M_\mathrm{e}</math> the magnification of the eyepiece. The magnification of the objective depends on its [[focal length]] <math display="inline">f_\mathrm{o}</math> and on the distance <math display="inline">d</math> between objective back focal plane and the [[focal plane]] of the [[eyepiece]] (called the tube length):

<math display="block">M_\mathrm{o}={d \over f_\mathrm{o}}</math>

The magnification of the eyepiece depends upon its focal length <math display="inline">f_\mathrm{e}</math> and is calculated by the same equation as that of a magnifying glass:

<math display="block">M_\mathrm{e}={25\ \mathrm{cm} \over f_\mathrm{e}}</math>

Note that both astronomical telescopes as well as simple microscopes produce an inverted image, thus the equation for the magnification of a telescope or microscope is often given with a [[Plus and minus signs|minus sign]].{{Citation needed|date=January 2009}}