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Which question is this?Acha tw here's the thing ..
First of all as they've given 0.1 mm which is equal to 100 um
If u count the number of units in between the eye piece graticule.. They are 40 units in total
So that means 40 units = 100 um
Now measure the length as in the units using the micrometer scale given.. That is almost 4 units
Now cross multiply
40 units = 100 um
4 units = x
Answer is 10