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Need help with optics question involving microscope?

A microscope has an objective lens with a focal length of 16.22 mm and an eyepiece with a focal length of 9.00 mm. With the length of the barrel set at 33.0 cm, the diameter of a red blood cell's image subtends an angle of 1.43 mrad with the eye. If the final image distance is 33.0 cm from the eyepiece, what is the actual diameter of the red blood cell?

Hi, I don't know if you go to UF and are in physics 2, but I am-- and this same exact question is in my homework due in about 2.5 hours!

This link greatly helped me solve this problem. It provides step-by-step explanations too....which is great!

http://nngroup.physics.sunysb.edu/~chiaki/PHY122-06/Homework/Problem25.doc

Hope this helps!
-Mercury-

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