The Objective Lens and the Eyepiece of a Microscope Have

Multiple Choice

The objective lens and the eyepiece of a microscope have focal lengths of 4.0 mm and 25 mm,respectively.The objective produces a real image 30 times the size of the object,with the final image viewed at infinity.The near point of the microscope user is at 25 cm.What is the magnitude of the overall magnification of the microscope?

A) 250
B) 300
C) 350
D) 400
E) 450