A magnifying lens is used to magnify an insect. If the real length of the insect is \( \mathbf{0.4\ mm} \) and its length after magnification is \( \mathbf{4.8\ cm} \). Find the magnification ratio.
length in drawing = \( 4.8 \times 10 = 48 \) mm
Ratio of magnification = \( \frac{\text{length in drawing}}{\text{real length}} = \frac{48}{0.4} \)
\( = 120 : 1 \)
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