Working: Suppose a small object AB is placed slightly away from the first focus F0' of the objective lens. The objective lens forms the real, inverted and magnified image A'B', which acts as an object for eyepiece. The eyepiece is so adjusted that the image A'B' between the first focus Fe' and the eyepiece E. The eyepiece forms its image A B which is virtual, * and magnified. Thus the final image A B formed by the microscope is inverted and magnified and its position is outside the objective and eyepiece towards objective lens. Magnifying power of compound microscope is
for final image at distance of distinct vision
for final image at infinity
(ii) For large magnifying power, f0 and fe both have to be small.
