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Eyepiece graticule and stage micrometer Watch

1. What I did:
1 EPG unit - 0.1 x 40 = 4 mm = 4000 micrometres.
x EPG units - 10 micrometres.
Got 2.5 x 10-3.
What's wrong?????????????
2. if the whole micrometer line is 0.1 mm long....

so one graticule unit is 0.04 mm long or 40 um.

so 1/4 of a graticule unit would cover a 10 um wbc!!

so is it possibe there was a typo? if the micrometer was 1 mm long the answer would be 4??
3. hey

so first I convert 1mm into um, so 1mm = 100 um

then to find the size of one eyepiece graticule division we divide 100um by 40 (there are 40 divisions on the eyepiece graticule in one stage micrometer division), which gives us 2.5 um

Then to find the amount of divisions that will cover a 10um cell, we divide 10 um by 2.5 um, which gives us 4

I hope it helps, it may be wrong but this is what I got

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