1 The diagram shows a stage micrometer scale viewed with an eyepiece graticule, using a magnification of ×200.
Using the same magnification, a chloroplast is measured as 4 eyepiece graticule divisions long. How long is the chloroplast?

$1.0 \times {10^1}\mu {\rm M}$
2 )
$4.0 \times {10^2}\mu {\rm M}$
3 )
$2.5 \times {10^{ - 1}}\mu {\rm M}$
4 )
$2.5 \times {10^{ - 2}}\mu {\rm M}$
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