The diagram shows a stage micrometer on which the small divisions are 0.1 mm. It is viewed through an eyepiece containing a graticule.
The stage micrometer is replaced by a slide of a plant cell.
What is the width of a chloroplast?

1 )
$5\mu m$
$10\mu m$
3 )
$50\mu m$
4 )
$100\mu m$
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