The diagram illustrates a transverse section of a blood capillary. The lumen has a diameter of $7\,\mu\text{m}$. What is the magnification of the drawing?
- A$\times 200$
- B$\times 245$
- C$\times 500$
- D$\times 5000$
Biology 9700 · AS & A Level · The microscope in cell studies