Practical Biology, Experimental Design, and Data Handling
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Free Biology Q & A Practice 1 of 5 free exam-style exercises in this topic
A student calibrated an eyepiece graticule using a stage micrometer slide in which each division is \(0.01\text{ mm}\) (field A). Using the same objective lens, the student then measured a human cheek cell (field B).

A: calibration (same objective lens) 0 10 20 30 40 50 60 70 80 90 100 stage micrometer (red): 1 division = 0.01 mm lines coincide at 0 and at 40 eyepiece units B: cheek cell 0 10 20 30 cell spans 18 eyepiece units (graticule numbers shown are eyepiece units)


What is the actual width of the cheek cell?
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