Magnification (Edexcel GCSE Biology Combined Science): Flashcards

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Magnification
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Formula for total magnification of microscope

eyepiece lens mag. × objective lens mag.

Formula for magnification

magnification=imagesizerealsizemagnification = \frac{image size}{real size}

1 mm in standard form (metres)

1×1031 \times 10^{-3} m

1 μm in standard form (metres)

1×1061 \times 10^{-6} m

1 nm in standard form (metres)

1×1091 \times 10^{-9} m

Size range of most human cells

10-30 μm

Typical size range of bacteria

1-5 μm

Size range of viruses

20-300 nm

Size of ribosomes

Around 20 nm

Width of DNA molecules

About 2 nm

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