The eyepiece of a microscope is fitted with an eyepiece graticule and a stage micrometer scale is placed on the microscope.
Which statements about the stage micrometer scale are correct?
1 It allows you to measure the actual length of cells.
2 It allows you to calibrate the eyepiece graticule.
3 It changes in size as the objective lens changes from $ \times 10$ to $ \times 40$.
1 )
1, 2 and 3
2 and 3 only
3 )
1 only
4 )
2 only
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