A Laboratory Model of Compound Microscope
It is an optical instrument used for observing highly magnified images of tiny objects.
O - Objective
E - Eyepiece
D - Distance of distinct vision
AB - Object
A'B' - First image
A"B" - Final image
O1,O2 - are optic centers of O and E
O, FO - Focal length of objective
O, Fe - Focal length of eyepiece
Magnifying power of compound microscope is defined as the ratio of the angle subtended at the eye by the final image to the angle subtended at the eye by the object, when both the final image and the object are situated at the least distance of distant vision from the eye.
m = magnification produced x magnification produced due to eye lens due to objective lens
m = me x mo
(-ve sign shows that final image is inverted with respect to the object)
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If the object is very close to fo, the focus of lens O then
and as A
lB
l is very close to the eye lens
Vo = OlBl O1O2 = L = length of tube
If f
o and f
e both are small then magnifying power will be large.
