2. Eyepiece (Ocular Lens) Body Tube Revolving Nosepiece Arm Objective Lens Stage Stage Clips Coarse Adjustment Knob Fine Adjustment Knob Base Diaphragm Light Source

3. Bell Ringer #8 Compound Microscope Bell Ringer 1. In what kind of studies would scientists select a microscope to collect data? –When structures to be studied are to small to see with the naked/unaided eye 2. Why must you wash your hands after every scientific activity? –You may be in contact with organisms you cannot see.

4. Robert Hooke –1635-1703 –Entered Westminster School at the age of thirteen –impressed scientists with his skills at designing experiments and building equipment – Devised the compound microscope – Wrote Micrographia – Known as the Father of Microscopy – the originator of the word cell in biology

5. Compound Microscope What type of objects you would view under a compound microscope? –Fabric weave –Goldfish scales –Epithelia cells –Bacteria, Algae, Protozoa –Strands of hair –Sections of major organs –Sections of leaves, seeds, roots, flowers –Insects

6. Vocabulary Words 1.Compound light microscope –microscope that allows light to pass through a specimen and uses two lenses to form an image 2.Microscope –Device that produces magnified images of structures that are too small to see with the unaided eye 3.Electron Microscope –Microscope that forms an image by focusing beams of electrons onto a specimen 4.Metric System –Decimal system of measurement based on certain physical standards and scaled on multiples of 10

8. Microscope parts and functions Arm Supports the body tube and stage Base Provides a firm and steady support Body Tube Holds the eyepiece lens and objective lens at the correct distance for magnification Coarse adjustment Elevates or lowers the body tube or stage a large distance with each turn of this knob

9. Microscope parts and functions Diaphragm Regulates the amount of light passing through the stage opening Eyepiece Usually contains one lens of 10 power magnification Fine adjustment Elevates or lowers the body tube or stage a small distance with each turn of this knob High power objective Usually a lens of 43 or 45 power magnification

10. Microscope parts and functions Lamp Provides the light needed to view the specimen Low Power objective Usually a lens of 10 power magnification Mirror Directs light through the stage opening and eyepiece to view the specimen Nosepiece Revolves so that the high and low power objectives may be switched

11. Microscope parts and functions Stage Where the microscope slide is placed for viewing Stage Clip Holds the slide firmly in place on the stage Stage Opening A hole in the stage that allows light to pass through

12. Microscope parts