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Cameroon GCE A-Level Biology Practice Questions - Cameroon General Certificate Of Education Advanced Level Biology (Subject Code 0710) Exam

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A student using a light microscope with a 10x eyepiece lens and a 40x objective lens measures an onion epidermal cell to be 48 mm long on a calibrated photomicrograph with a total magnification of 400x. What is the actual length of the cell in micrometres (µm)?
Correct Answer:
120 µm

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