# Problem: A standardized biological microscope has an 8.0-mm-focal-length objective.What focal-length eyepiece should be used to achieve a total magnification of 200x ?

###### FREE Expert Solution

Microscope magnification:

$\overline{){\mathbf{M}}{\mathbf{=}}\frac{{\mathbf{D}}_{\mathbf{o}}\mathbf{D}}{{\mathbf{f}}_{\mathbf{e}}{\mathbf{f}}_{\mathbf{o}}}}$ Do is the tube length usually 160mm, D is the distance of closest vision usually 250mm, fe is the eyepiece focal length and fo is the objective lens focal length.

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###### Problem Details

A standardized biological microscope has an 8.0-mm-focal-length objective.
What focal-length eyepiece should be used to achieve a total magnification of 200x ?