The eyepiece lens of a microscope is fitted with an eyepiece graticule.
Which statements about the graticule are correct?
1 It allows you to measure the actual length of cells.
2 It allows you to draw cells with correct proportions.
3 It changes in size as the objective lens changes from $ \times 10$ to $ \times 40$.
1 )
1, 2 and 3
2 )
1 and 3 only
3 )
1 only
2 only
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