Specimens are measured in microns (µm)!

1 millimeter = 1000 microns (micro meters)

If this caterpillar is 20mm long, how many microns is it?

(20mm)(1000) = 20,000 microns

Which magnification will show more space, 40X or 100X?

40X40X will show more than 100X

Ruler at 40X

How many mm across?3mm

How many microns across?

3,000 µm

3 X 1000 = 3,000 µm across

How many millimeters? Microns?

High power magnification

Low power magnification=

Low power diameter

High power diameter

400

40= 3 mm

X

(40)(3mm) = (400)(X)

120mm = 400X

120mm

400

0.3mm=

How many microns is that?

0.3mm X 1000 = ?

300 µm

If the field of view is 600 microns across, how far across is one specimen?

If you can fit 6 across 600 microns, how far across is one circle?

Diameter / # of objects

600 microns/6 circles = 100 microns each

400X

40X100X

400X

40X

100X

400X