Editing Objective (optics) (section)

===Magnification===
One of the most important properties of microscope objectives is their [[magnification]]. The magnification typically ranges from 4× to 100×. It is combined with the magnification of the [[eyepiece]] to determine the overall magnification of the microscope; a 4× objective with a 10× eyepiece produces an image that is 40 times the size of the object.

A typical microscope has three or four objective lenses with different magnifications, screwed into a circular "nosepiece" which may be rotated to select the required lens. These lenses are often color coded for easier use. The least powerful lens is called the ''scanning objective lens'', and is typically a 4× objective. The second lens is referred to as the ''small objective lens'' and is typically a 10× lens. The most powerful lens out of the three is referred to as the ''large objective lens'' and is typically 40–100×.