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katierob

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## Homework Statement

A microscope has an objective lens with a focal length of 16.22 mm and an eyepiece with a focal length of 9.30 mm. With the length of the barrel set at 25.0 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 25.0 cm from the eyepiece, what is the actual diameter of the red blood cell?

h1 =

## Homework Equations

m=-L/Fo(25cm/Fe)

m=hi/ho

## The Attempt at a Solution

I can't figure out how to get the object height without the image height? I think it has something to do with the angle at which the image subtends with the eye, but I don't have an equation for that, so I don't know where to go once I get m.