A student measures a leaf cell as 0.05 mm under a microscope with magnification ×400. What is the length of the image?
Answer and explanation
Correct answer: C. 20 mm
- Step 1: Image size = actual size × magnification.
- Step 2: 0.05 × 400 = 20 mm.
Answer
20 mm.
Why not the others: 0.0125 mm: this divides by 4 instead of multiplying by 400. 2 mm: the decimal point was misplaced by one place. 200 mm: the decimal point was misplaced by one place the other way.
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