Final answer:
The length of one cell cannot be accurately determined without additional details. A typical human red blood cell is around 8 micrometers in diameter, but we need to know the number of cells across the 8mm field to calculate the size of the cell in question.
Step-by-step explanation:
The question asks for the calculation of the length of one cell in micrometers when the field of view is 8mm wide. To provide an answer, more information would be required, such as the number of cells that span the 8mm field of view. Knowing that a typical human red blood cell is approximately 8 micrometers in diameter, if we could fit 1,000 of those across the field of view (which translates into 8mm or 8,000 micrometers), each cell would indeed be 8 micrometers as well. However, without additional details about the specific situation in the microscope, we cannot definitively pick one of the provided options (a) 8 micrometers, b) 80 micrometers, c) 800 micrometers, d) 8000 micrometers). Light microscopes are commonly used in biology to observe small structures such as cells, and understanding how to calculate cell size is essential for interpreting these observations.