The diagram shows a stage micrometer scale, with divisions 0.1 mm apart, viewed through an eyepiece containing a graticule.
What is the area of the field of view of the microscope at this magnification? ($\pi = 3.14$)

1 )
$\pi \times 12.5 \times 12.5 = 4.9 \times {10^2}\,\mu {m^2}$
2 )
$\pi \times 50 \times 50 = 7.9 \times {10^3}\,\mu {m^2}$
$\pi \times 125 \times 125 = 4.9 \times {10^4}\,\mu {m^2}$
4 )
$\pi \times 250 \times 250 = 2.9 \times {10^5}\,\mu {m^2}$
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