A pollen grain was viewed with a microscope using ×500 magnification.
The image size of the pollen grain was measured as 75 mm.
Which calculation would give the actual size of the pollen grain in millimetres?
$\frac{{75}}{{500}}$
2 )
$\frac{{500}}{{75}}$
3 )
$\frac{{75 \times 1000}}{{500}}$
4 )
$\frac{{500}}{{75 \times 1000}}$
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