Work out magnification, image size and actual size for real cells and cell parts. Every question uses the rules below, and wrong answers get feedback on the exact slip you made.
The rules
- magnification = image size ÷ actual size. Image size is how big it looks in the drawing or photo. Actual size is how big it really is.
- Rearrange when you need to: image size = magnification × actual size, and actual size = image size ÷ magnification.
- Put both sizes in the same unit first. 1 mm = 1000 µm and 1 µm = 1000 nm.
- Magnification has no unit. Write it as ×400, and it is bigger than 1.
- Scale bars: the bar’s length on the image ÷ the size written on it gives the magnification. Convert to the same unit first.
- Standard form: very small sizes in mm or m are written like 2 × 10⁻⁶ m. Type 2e-6 or 2×10^-6.
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For standard form, type 3.2e-6 or 3.2×10^-6.