Optical Instruments – Compound Microscope

Compound Microscope

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: