Figure 8 shows a root hair viewed using a microscope - AQA - GCSE Biology Combined Science - Question 5 - 2019 - Paper 1

To find the real length of the root hair, we use the formula:

$\text{Real Length} = \frac{\text{Image Length}}{\text{Magnification}}$

Given:

• Image Length (X–Y) = 43 mm
• Magnification = 50

Substituting the values:

$\text{Real Length} = \frac{43 \text{ mm}}{50} = 0.86 \text{ mm}$

To convert millimeters to micrometers, we multiply by 1000:

$0.86 \text{ mm} \times 1000 = 860 \text{ μm}$

Therefore, the real length of the root hair is 860 μm.