Grade 9 Biology Microscopy question help

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liamlarner
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I Need help with this 4 marker grade 9 microscope practical question for GCSE Biology AQA Triple from my grade 8/9 booster collins workbook

3) Matilda is using a light microscope to view cheek cells.She uses an eyepiece graticule.
Describe how matilda could use an eyepiece graticule to measure the size of a cheek cell (4 marks)

i just don't understand how you measure cells using a light microscope is this a A Level Biology question but just at GCSE
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flowerscat
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An eyepiece graticule is calibrated with a stage micrometer, for a particular magnification. This allows you to work out what each division of the eye piece graticule corresponds to (in micrometers). You only do this once for every microscope.

When you need to measure the size of a cheek cell, place the eye piece graticule in the eyepiece.
Place the cheek cell on the stage.
At 10 x magnification, work out how many lines on the graticule line up with the width of the cheek cell (the widest point).
Multiply the number of lines (graticule) by the value of each division (say 0.01 um). This will give you the width of the cheek cell in micrometers (um)
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