1. MICROSCOPES
4th Quarter
2008

2. MICROSCOPES MAGNIFIES OBJECTS (MAKES OBJECTS LOOK BIGGER)
HELP SCIENTISTS STUDY OBJECTS & LIVING THINGS TOO SMALL TO SEE WITH THE NAKED EYE

3. 3 Types of Microscopes
simple microscope has only 1 lens. compound microscope has 2 sets of lenses. It can magnify things times larger than they really are.
electron microscope can magnify objects up to 300,000 times. They do not use lenses, but use electrons to enlarge the image.

4. PARTS OF A MICROSCOPE eyepiece
the lens of the microscope that you look through
course adjustment
the large knob on the microscope that you turn to bring the object into COARSE focus
fine adjustment
the small knob on the microscope that brings the image into SHARPEST focus

5. PARTS OF A MICROSCOPE arm body tube nosepiece
the part of the microscope supporting the body tube
body tube
the part that holds the eyepiece and the objective lenses.
nosepiece
the part at the bottom of the body tube that holds the objective lenses and allows them to be turned

6. high power objective lens
the lens that magnifies the object the greatest amount. (usually 40x)
Low power (scanner) objective lens
the lens that magnifies the object the least amount (usually used to find the object; magnifies only 3 or 4 times)
middle power objective lens
the lens that usually magnifies the object more than the scanner lens, but less than the high power lens (usually 10x to 20x)

7. 10. stage
the flat part below the objectives lens where the slide is placed
11. clip
the part that holds the slide in place so it doesn’t move
12. diaphragm
the part that controls the amount of light entering the field of view

8. 13. light source
the lamp (or mirror) under the stage that sends light through the object being viewed.
14. base
the bottom part that supports the rest of the microscope

9. Making a Wet Mount Slide
1. Use dropper to place a drop of water on the center of a clean slide.
2. Use tweezers to lay specimen on the drop of water.
3. Gently touch the cover slip to the edge of the drop of water to cover the specimen & the water.

10. Appearance of the Specimen
Objects appear upside-down & backward
Movement appears to be in opposite direction than actual movement
move slide
slide appears to move

11. Field of View
Field of view is the area (circle) that you see when looking through the eyepiece

12. Calculating Magnification
1. Find the power of the lens. It is found on the side of the lens. Magnification power of a lens is always identified by the label of x (10x, 1000x)
2. Multiply the power of the eyepiece by the power of the objective lens.
3. Examples:
eyepiece obj. lens
10x times x
10x times x
10x times x

13. Recording Observations
Draw specimen large enough to fill “field of view” circle
Draw as many details as possible
Drawing should be neat
Label specimen
Label power of magnification
Name & date on paper