The student used an eyepiece graticule to calculate the size of some of the onion cells. Figure I shows the student's eyepiece graticule and stage micrometer. The stage micrometer measures in millimetres. 0 mm 0 Figure 1 10 20 30 the slide. 40 Eyepiece graticule 2 Stage micrometer Use Figure 1 to calculate the size of one division on the student's eyepiece graticule, in micrometres. Show your working.

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