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## Homework Statement

The barrel of a compound microscope is 15.9 cm in length. The specimen will be mounted 1.17 cm from the objective, and the eyepiece has a 5.00 cm focal length. Determine the focal length of the objective lens.

## Homework Equations

I am using the mirror equation.

## The Attempt at a Solution

1/1.17 cm+1/s'=1/15.9 cm

-1.26 cm

adding 1.26 to 1.17=2.433

1/2.433+1/x=1/1.17 this gives me 2.25 cm

I am so lost. Any guidance would be appreciated.[/B]