Units and magnification
Tiny units
1 mm = 1000 μm
1 μm = 1000 nm
1 μm = 1 × 10⁻⁶ m, 1 nm = 1 × 10⁻⁹ m
Cells are tens of micrometres across; ribosomes are about 20 nm. Very small sizes are written in standard form.
Magnification
magnification = size of image ÷ size of real object
- A cell drawn 24 mm long is really 30 μm long
- 24 mm = 24 000 μm
- magnification = 24 000 ÷ 30 = × 800
Put both sizes in the same unit before you divide. Total magnification of a light microscope = eyepiece × objective.
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