2. 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

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

4. Ruler at 40X How many mm across? 3mm How many microns across? 3,000 µm 3 X 1000 = 3,000 µm across

5.  How many millimeters? Microns?

6. High power magnification Low power magnification = Low power diameter High power diameter

7. 400 40 = 3 mm X (40)(3mm) = (400)(X) 120mm = 400X 120mm 400 0.3mm =

8. How many microns is that? 0.3mm X 1000 = ? 300 µm

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

10. If you can fit 6 across 600 microns, how far across is one circle? Diameter / # of objects 600 microns/6 circles = 100 microns each

11. 400X

12. 40X 100X 400X

13. 40X 100X 400X