The diagram shows an eyepiece graticule and part of a stage micrometer scale as seen using $ \times 100$ magnification.
How is the value, in µm, of one eyepiece graticule unit calculated?
1 )
divide 100 by 0.1 and multiply by 1000
2 )
divide 100 by 0.1 and multiply by 1000 divided by 100
multiply 0.1 by 1000 and divide by 100
4 )
multiply 0.1 by 1000 and divide by 100 then divide again by 100
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