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Lenses/Compound Microscope

Hi. Can someone please show me how to do the following problem? Thank you.

"A compound microscope has the objective and eyepiece mounted in a tube that is 18.0 cm long. The focal length of the eyepiece is 2.28 cm, and the near-point distance of the person using the microscope is 25.0 cm. If the person can view the image produced by the microscope with a completely relaxed eye, and the angular magnification is -4125, what is the focal length of the objective? (Include the sign.)"

Solution Summary

The solution includes step-by-step calculations for finding the focal length of a microscope.