An eyepiece graticule has a scale with 100 divisions. A stage micrometer has a scale with 50 divisions, each of which is 0.040mm apart.
Using a $ \times 40$ objective lens, the whole length of this stage micrometer scale lines up with 15 divisions of the eyepiece graticule.
What is the actual length of the 100 division scale of the eyepiece graticule?
1 )
$1.3{\text{ }}mm$
$13{\text{ }}mm$
3 )
$75\mu m$
4 )
$750\mu m$
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