**A.**

Magnification of the microscope:

M = m_{o}m_{e}, where m_{o} is the magnification power of the objective, and m_{e} is the magnification power of the eyepiece.

A standard biological microscope is required to have a magnification of 200X.

A. When paired with a 10X eyepiece, what power objective is needed to get this magnification?

B. Assume that the length of the tube of a standard biological microscope is 16 cm. What is the focal length of the objective?

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