A Microscope consists of an objective lens and an ocular lens (eyepiece lens). Both of them are positive lens. The focal length of the objective lens is less than the focal length of the ocular lens. The object is placed a little further than it focus. The final image resulted by the ocular lens is inverted and virtual.
Angle magnification for objective lens
Where :
Mob = angle magnification of objective lens
fob = focal length of the objective lens
S’ob = the distance of objective’s image from the objective lens
Sob = the distance of the objective’s object from the objective lens
Angle magnification for the ocular lens
Angle magnification of the ocular lens similar to that for the magnifying glass. Basically the ocular lens functions just as the magnifying glass.
If the ocular’s image located at the near point then
If the ocular’s image located at the far point (for normal eyes) then
If the ocular’s image located at a distance x between the near point and far point then
The total magnification of the microscope is
The distance of the ocular object in front of the ocular lens is given by
Wherever the ocular’s image located. The length of the microscope cylinder is
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