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.
I am using the mirror equation.
The Attempt at a Solution
1/1.17 cm+1/s'=1/15.9 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]