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? – – – – – – – – 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