1. Microscopes

2. Microscope: A tool used by people to enlarge microscopic objects
Microscopic: extremely small, cannot be seen without a microscope

3. Lens- a curved transparent piece of glass that bends light, which may increase the size of the object
Simple microscope- has one lens
Compound microscope- has two or more lenses
Electron microscope- uses beams of electrons to magnify objects, instead of light

4. Parts of the microscope
Eyepiece (or ocular)- used to look through and helps to magnify
Body tube- holds the lenses at the proper distance so the microscope can focus
Revolving nose piece- holds and allows the objective to be turned into viewing position

5. Objectives- are the lenses
Low power is 4 times magnification. Always start and end with this lens.
High power is 40 times magnification. It is longest lens, never use the coarse adjustment knob with high power lens

6. Stage- the place that the slide is put on
Stage clip- holds the slide in place
Diaphragm- controls the amount of light that is passing through an object
Fine adjustment knob- smallest of the two knobs, used to sharpen image
Coarse adjustment knob- largest of the two knobs, used for a quick focus, never on high power

7. Arm- supports the microscope and is used to carry it
Base- supports the microscope and is used to carry it
Light source- provides the light

8. Magnify The word magnify means “make bigger”.
The number on microscope lenses tell you how much they magnify the image of the object you are looking at.
The magnification of a lens is also referred to as its power.

9. Total magnification
The objective lenses have different numbers on them.
To determine the total magnification of an objective lens and the eyepiece working together, you multiply the magnifications together.
Example: When you use 10x eyepiece with 4x objective lens total magnification is 40x.

10. Using the microscope

11. Using the microscope
Carry the microscope- with one hand on the base and one hand on the arm
Do not touch- the lens with your finger
Always focus- first with the low power objective
Do not use the coarse adjustment knob to focus the high power objective lens
Use only the fine adjustment knob when focusing on the high power objective lens.

12. Using the microscope
1. Place the microscope on a flat surface away from the edge of the table.
2. Look through the eye piece, adjust the diaphragm for the best amount of light.
3. Place the slide on the stage so the object is in the center.
4. Always focus first with the low power objective and the coarse adjustment knob.