Object lens: Higher power
Eye lens: Lower power
Position of the object:
The object is placed at a position between fo and 2fo.
Nature of the image, I1:
Real, inverted and magnified
Position of the image, I1:
The first image, I1 must be placed between the optical center of the eye lens with the eye lens principle focus point, fe.
Nature of the image, I2: Virtual, inverted and magnified
Distance in between the two lenses:
The distance between the object lens and the eye lens in a compound microscope is bigger than the sum of the focal length (fo + fe).
If the distance between both lenses are adjusted to less than (fo + fe), no image can be seen.
Magnification of the compound microscope: