Transcript The Compound Microscope

Body Tube
Revolving Nosepiece
Objective Lens
Stage
Clips
Diaphragm
Eyepiece
(Ocular Lens)
Arm
Stage
Coarse Adjustment Knob
Fine Adjustment Knob
Light Source
Base
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.
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
Compound Microscope
• What type of objects you would view under a
compound microscope?
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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 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
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
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
• Nosepiece
Revolves 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
Microscope parts