HOW CAN I TELL IF A CELL HAS DEPTH BY USING A MICROSCOPE??

When you observe a cell under a microscope, especially at higher
magnification, the fact that you have to focus up and down through the cell
to see different parts of it is an indicator that the cell has a certain
thickness. On some microscopes, the fine focus is calibrated in microns
(millionths of a meter) so you can actually measure the approximate
thickness of a cell by how far you turn the fine focus knob to focus from
one side of the cell to the other. In general, cells are about 10 to 20
microns in thickness but this can vary quite a bit depending on the cell
type and how it was prepared. Some more sophistacated microscopes like
Laser Scanning Confocal Microscope or a Scanning Electron Microscope allow
you to take more accurate measurements of cell thickness but a simple
student microscope can give you a pretty good estimate.

thank you

you are truly welcome;-)