Microscope and Cell Theory Flashcards
Eyepeice
To look through, contians magnifying glass
Revolving Nosepeice
To change the magnification
Coarce Adjustment knob
To focus the object, move the stage up or down
Fine Adjustment Knob
Focus object, move the stage up or down slightly
Stage
To put the slide on
Stage Clips
To hold the slide down
Diaphram
To adjust the amount of light
Light
To see the object
Base
Holds the microscope
Arm
To carry the object
Low, medium, and high objective lens
magnify your objects
Hooke
Discovered and named cells, 1663
Van Loewenhoek
First to discover microscopic creatures (‘animlcules’), 1660’s
Schleiden
said all plants are made of cells, 1838
Schwann
said all animals are made of cells, 1839
Virchow
said that living things only come from other living things, 1855
3 main ideas of cell theory
All living things are composed of cells, cells are the basic units of structure and function in living things, all cells come from pre-existing cells
Light Microscopes
uses light to veiw objects, simple or compound, small and portable, can magnify up too 100,000 times, very good resolution, can only see living and dead things
Electron Microscopes
uses beam of electrons to view object, scanning and transmittion, magnify up to 100,000 times, very good resoultion, can can only see dead things
Low power vs High power
Low power: you can see more of the overall image, less detail
High power: you can see less overall image, more detail
Find total magification of the comound microscope if given magnifications of the ocular and objective lenses.
Multiply the magnification of the eyepiece times the magnification of the objective lens to get the total magnification.
Example: low power in our microscopes: 10x4=40X
