A specimen 2 cm long is drawn 6 cm long. The magnification of the drawing is:
A×4
B×12
C×0.33
D×3
Answer & Solution
Correct answer: D. ×3
1. Magnification = linear dimension of the drawing ÷ linear dimension of the specimen.
2. The drawing measures 6 cm and the specimen 2 cm.
3. So magnification = 6 ÷ 2 = 3, written ×3.
4. Multiplying the two lengths instead gives 12, a common wrong formula.
5. Dividing the specimen by the drawing inverts the ratio and gives 0.33, which would mean the drawing is smaller than the specimen.
_Source: NECTA ACSEE 2023 Biology 133/1, Question 4: Cytology_
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