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

Microscope parts