Eyepiece (Ocular Lens)
Body Tube
Revolving NosepieceArm
Objective Lens
StageStage Clips
Coarse Adjustment Knob
Fine Adjustment Knob
Base
Diaphragm
Light Source
Bell Ringer #8 Compound Microscope
Bell RingerBell 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.
Robert HookeRobert 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
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
Vocabulary Words
1. Compound light microscope– microscope that allows light to pass through a specimen and
uses two lenses to form an image2. 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 specimen4. Metric System
– Decimal system of measurement based on certain physical standards and scaled on multiples of 10
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 adjustmentElevates or lowers the body tube or stage a large distance with each turn of this knob
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
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
• NosepieceRevolves so that the high and low power objectives may be switched
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
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