1. Measuring the length of cells
What is the diameter of the low power field of view?
the lines are millimeters (mm)
ruler
Diameter = 4 mm (4,000 um)
What would the ruler look like when we switch to high power?

2. How can we figure out the diameter of the high power field of view?or
How can we figure out the diameter of the high power field of view?

3. How can we figure out the diameter of the high power field of view?
How much stronger is high power magnification than low power magnification?
10 x
low power
40X
high power
400X
High power = 1/10th of low power diameter diameter

4. Low Power Diameter = 4 mm (4,000 um)
ruler
High power = 1/10th of low power diameter diameter
High power = 1/10th of 4,000um diameter
High power = 400um

5. How can we figure out the diameter of the medium power field of view?
How much stronger is high power magnification than low power magnification?
X 2.5 ?x
Low power
40X
Medium power
100X
Medium power = ? of low power diameter diameter

6. Medium power = 1/2.5 of 4,000um diameter

7. Low Power High Power
40 X X

8. Low Power Medium Power 40 X 100 X
How would you move the slide to get specimen A to the middle of the field of view?
Specimen A
Low Power Medium Power
40 X X

9. Medium Power High Power
100 X X

10. Depth of Field

13. parfocal
A parfocal lens is a lens that stays in focus when magnification is changed.
There is inevitably some amount of focus error, but small enough to be considered insignificant.
pertaining to different eyepieces (of telescopes or microscopes) that all focus their images in the same plane, so that they can be interchanged without readjusting the instrument.

14. Resolution –
the ability of a microscope to show two points that are close together as separate images