A student calibrated an eyepiece graticule using a stage micrometer.
$ \bullet $ Each division of the stage micrometer was 0.01 mm.
$ \bullet $ With a ×10 magnification objective lens, 10 eyepiece graticule units matched
10 divisions on the stage micrometer.
The same microscope was used with a ×40, instead of a ×10, magnification objective lens to measure the diameter of an alveolus. The diameter of the alveolus was found to be 96 eyepiece graticule units.
The eyepiece lens was not changed.
What is the best estimate for the diameter of the alveolus?
1 )
0.960 mm
2 )
3.84 mm
$240\mu m$
4 )
$384\mu m$
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