7Estimating cell size at medium magnification 121 mm1mm / 12 cells = mm51mm / 5cells=0.2 mm1 mm
8Diameter of field of view/mm Other unitsDiameter of field of view/mmNo. of cells lengthwaysNo. of cells widthwaysMean length (mm)Mean width (mm)1.005120.20.0831mm = 1000µmMean length of cells = 0.2 x 1000 = 200µmMean width of cells = x 1000 = 83µm
16Cell Magnification ____ 0.005 mm This diagram shows the general structure of an animal cell from an electron microscope.Calculate the magnification factor.Calculate the length of G - a mitochondrion.Calculate the diameter of the nucleus.Calculate the width of the cell at its widest part.____ mm
17Plant cell magnification Diagram shows the generalised structure of a plant cell as seen with an electron microscope.Calculate the magnification factor.Calculate the width of the cell.Calculate the length of the vacuole.____ mm
18Exam tipMagnification of an Illustration = Size of Illustration / Actual SizeFor example, a magnification of 1x means the illustration is the same size as the object, 100x means the illustration is 100 times bigger than the object, etc. It is important that you first calculate or measure the actual size of an object, and from that calculate the magnification of the illustration .Always draw the magic triangle and fill in the information you have.Always check your units.