how do we find the cell dimension of a onion cell?

Answer 1

Use a millimeter rule. Place the transparent millimeter rule on the stage of the microscope. Observe the length of the diameter in millimeters of the field of view at each available magnification. Fill in the following chart:

objective magnification diameter (mm)
low power
medium power
high power
Use the information in the chart above, in which you determined the diameter of the field of view at each magnification, to measure approximately the average length and width of an onion cell.