The diagram shows a stage micrometer scale viewed with an eyepiece graticule, using a magnification of $ \times 200$.
Using the same magnification, a chloroplast is measured as 4 eyepiece graticule divisions long.
How long is the chloroplast?
$1.0 \times {10^1}\mu m$
2 )
$4.0 \times {10^2}\mu m$
3 )
$2.5 \times {10^{ - 1}}\mu m$
4 )
$2.5 \times {10^{-2}}\mu m$
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