Introduction to the Microscope

Introduction to the Microscope

HistoryCarePartsFocusing

• Timeline of lens and microscope inventions

Eyepiece

Body Tube

Revolving NosepieceArm

Objective Lens

StageStage Clips

Coarse Adjustment Knob

Fine Adjustment Knob

Base

Diaphragm

Light

1. Always carry with 2 hands.

2. Only use lens paper for cleaning.

3. Do not force knobs.

4. Always store covered.

5. Keep objects clear of desk and cords.

6. Place the slide on the microscope.

7. Use stage clips to hold specimen down.

8. Click nosepiece to the lowest (shortest knob) setting.

9. Look into the Eyepiece/Ocular.

10. Use the Coarse Adjustment Knob to see the specimen and use the Fine Adjustment Knob to fine tune the image.

• Follow steps to focus using low power

• Click the nosepiece to the longest objective

• Do NOT use the Coarse Adjustment Knob

• Use the Fine Adjustment Knob to bring the slide into focus

What can you find on your slide?

1. Place a few drops of liquid (water or dye) in the middle of the slide.

2. Place or smear your specimen into liquid.

3. Place cover slip on top of specimen at a 45 degree angle.

4. Gently tap out any air bubbles.

• Formula

Ocular (eyepiece) x Objective lens = Total

Magnification

• allows for binocular (two eyes) viewing of larger specimens.

• used to study the surfaces of solid specimens or to carry out close work such as sorting, and dissection.

• allow scientists to view a universe too small to be seen with a light microscope. SEMs don’t use light waves; they use electrons (negatively charged electrical particles) to magnify objects up to100,000 times.

• provides 3-d images of the specimen

• uses electrons, but instead of scanning the surface (as with SEM's) electrons are passed through very thin specimens.

• allows for good resolution (detail)

• magnifies up to 200,000 times

Cells Alive! & Others

• Cell structure is related to function• Cells in my back yard• SEM of red blood cell• Cell gallery• More SEMs• Even more SEMs• TEMs• More TEMs