A Compound Microscope Has an Objective with a Focal Length

Multiple Choice

A compound microscope has an objective with a focal length of 3.00 mm and an eyepiece of focal length 6.00 cm. It is adjusted for minimum eyestrain for persons with a near point of 25 cm. If the
Two lenses are separated by 40.0 cm, what is the total overall magnification?

A) 2200
B) 470
C) 550
D) 56
E) 28