Magnifying Visors

How can i answer this optics question for physics?

The problem is as follows: A crude symmetric hand held microscope consists of two converging lenses each of focal length 5.0cm fastened in the ends of a tube 40cm long. What is the overal angular magnification of the microscope? Use a near point of 25cm. I need help with this problem i cant even find the equation that i should use. Thanks!

Public Comments

1. I'm not sure how to interpret your numbers, but the formulas in this article may help http://en.wikipedia.org/wiki/Magnification#Calculating_the_magnification_of_optical_systems