Two lenses of focal length 0.45 cm and 0.35 cm are available for a compound microscope using an eyepiece of focal length of 3.0 cm, and the distance between the lenses has to be 15 cm.
(a) Which lens should be used as the objective: (1) the one with the longer focal length, (2) the one with the shorter focal length, or (3) either?
(b) What are the two possible total magnifications of the microscope?