The diagram depicts a stage micrometer, whose divisions are spaced by $0.1\,\text{mm}$, seen through an eyepiece that includes a graticule. That same eyepiece is then used to observe a blood smear. How many graticule divisions are needed to span the diameter of a white cell measuring $10\,\mu\text{m}$?
- A1
- B4
- C10
- D20