Which steps are needed to find the actual width of a xylem vessel viewed in transverse section using a $ \times 10$ objective lens?
1 Convert from mm to $\mu m$ by multiplying by ${10^{-3}}$.
2 Calibrate the eyepiece graticule using a stage micrometer on $ \times 4$ objective lens.
3 Measure the width of the xylem vessel using an eyepiece graticule.
4 Multiply the number of eyepiece graticule units by the calibration of the eyepiece graticule.
1 )
1, 2, 3 and 4
2 )
1 and 2 only
3 )
2, 3 and 4 only
3 and 4 only
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