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Yes, you're right, by calibration using a stage micrometer we can find out what exactly each division of the eyepiece graticule represents. We can do this because we know the real length of the divisions on stage micrometer, so we can equate the divisions of eyepiece graticule with the divisions of the stage micrometer. Note that a stage micrometer does get magnified and changes size if we change magnification. (so calibration must be done at every magnification)I'm confused about the 1st.. If we use it together with stage micrometer, we can actually measure cells, no? :/
However, in this question, stage micrometers are not mentioned. Eyepiece graticules alone cannot measure the real size of the specimen.