The diagram shows a stage micrometer viewed with an eyepiece graticule scale, using a magnification of ×400.
Using the same magnification, a chloroplast is measured and found to be 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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