The diagram depicts a stage micrometer with divisions spaced $0.1\,\text{mm}$ apart, as seen through an eyepiece that has a graticule. What is the area of the microscope’s field of view at this magnification? $(\pi = 3.14)$
- A$\pi \times 12.5 \times 12.5 = 4.9 \times 10^{2}\,\mu\text{m}^2$
- B$\pi \times 55 \times 55 = 9.5 \times 10^{3}\,\mu\text{m}^2$
- C$\pi \times 125 \times 125 = 4.9 \times 10^{4}\,\mu\text{m}^2$
- D$\pi \times 250 \times 250 = 2.0 \times 10^{5}\,\mu\text{m}^2$