# When viewed under a light microscope, the size of the cell in the diagram was 20 mm. The magnification of the image was x400. What is the actual size of the cell and give your answer in um (micrometres)?

Mar 8, 2017

$\text{Actual length" = "measured size" / "magnification}$

#### Explanation:

$\text{Actual length" = "measured size" / "magnification}$

So,

$\text{20 mm"/400 = "0.05mm}$

Since

$\text{1 mm} = 1000$ $\mu \text{m}$

The actual size $= 50$ $\mu \text{m}$