The diagram shows a stage micrometer, with divisions 0.10 mm apart, viewed through an eyepiece containing a graticule.
The area of the field of view of the microscope can be calculated using this formula.
$area = \pi {r^2}$
A student calculated the area of the field of view of the microscope using the information provided
and a value for $\pi $ of 3.142.
Which answer has been rounded correctly to an appropriate number of significant figures?
1 )
$0.04909{\text{ }}m{m^2}$
2 )
$5 \times {10^{-2}}m{m^2}$
3 )
$4.909 \times {10^4}\mu {m^2}$
$4.91 \times {10^4}\mu {m^2}$
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