Compound microscope (position of the object)

[dsenanayake]

Homework Statement

A microscope has a 1.6 cm focal-length eyepiece and 0.81 cm objective. Assume a relaxed normal eye.
(a) Calculate the position of the object if the distance between the lenses is 16.0 cm.
_____ cm (from the objective)
(b) Calculate the total magnification.
________

The Attempt at a Solution

i understand that you need to find the magnification of the objective lens but i don't know how to do that with only the focal lengths

 

[AvroArrow]

given. (a) The position of the object is 13.19 cm from the objective. (b) The total magnification is 20.