A student uses a microscope with a magnification of ×250 \times 250\,×250 to view plant cells. They draw a line A−BA-BA−B representing the length of a single cell on their drawing. The length of line A−BA-BA−B on the paper is measured as 45 mm.
State the length of line A−BA-BA−B in micrometres (μm\mu\text{m}μm), given that 1 mm=1000 μm1\text{ mm} = 1000\ \mu\text{m}1 mm=1000 μm.
Calculate the real length of the cell in micrometres (μm\mu\text{m}μm) using the formula:
real length=length of line A−B (in μm)magnification \text{real length} = \frac{\text{length of line } A-B\text{ (in } \mu\text{m}\text{)}}{\text{magnification}} real length=magnificationlength of line A−B (in μm)