The MicroscopeMr. Ryan6th Grade

The HistoryMany people experimented with making microscopes

Was the microscope originally made by accident? (Most people were creating telescopes)

The first microscope was 6 feet long!!!

The Greeks & Romans used lenses to magnify objects over 1000 years ago.

The HistoryHans and Zacharias Janssen of Holland in the 1590s created the first compound microscopeAnthony van Leeuwenhoek and Robert Hooke made improvements by working on the lenses

Anthony van Leeuwenhoek1632-1723Robert Hooke 1635-1703 Hooke Microscope

The HistoryZacharias Jansen1588-1631 The First Microscope

How a Microscope WorksConvex Lenses arecurved glass used to make microscopes(and glasses etc.)Convex Lenses bendlight and focus it inone spot.

How a Microscope WorksOcular Lens(Magnifies Image)Objective Lens(Gathers Light, Magnifies And Focuses Image Inside Body Tube)Body Tube(Image Focuses)Bending Light: The objective (bottom) convex lens magnifies and focuses (bends) the image inside the body tube and the ocular convex (top) lens of a microscope magnifies it (again).

The Parts of a Microscope

Body TubeNose PieceObjectiveLensesStage ClipsDiaphragmLight SourceOcular LensArmStageCoarse Adj.Fine AdjustmentBaseSkip to Magnification Section

Body TubeThe body tube holds the objective lenses and the ocular lens at the proper distanceDiagram

Nose PieceThe Nose Piece holds the objective lenses and can be turned to increase the magnificationDiagram

Objective LensesThe Objective Lenses increase magnification (usually from 10x to 40x)Diagram

Stage ClipsThese 2 clips hold the slide/specimen in place on the stage.Diagram

DiaphragmThe Diaphragm controls the amount of light on the slide/specimenTurn to let more light in or tomake dimmer.Diagram

Light SourceProjects light upwards through the diaphragm, the specimen and the lensesSome have lights, others have mirrors where you must move the mirror to reflect lightDiagram

Ocular Lens/EyepieceMagnifies the specimen imageDiagram

ArmUsed to support the microscope when carried. Holds the body tube, nose piece and objective lensesDiagram

StageSupports the slide/specimen Diagram

Coarse Adjustment KnobMoves the stage up and down (quickly) for focusing your imageDiagram

Fine Adjustment KnobThis knob moves the stage SLIGHTLY to sharpen the imageDiagram

BaseSupports the microscopeDiagram

Magnification

MagnificationTo determine your magnificationyou just multiply the ocular lens by the objective lensOcular 10x Objective 40x:10 x 40 = 400Objective Lens have their magnificationwritten on them.Ocular lenses usually magnifies by 10xSo the object is 400 times larger

Caring for a MicroscopeClean only with a soft cloth/tissue

Make sure its on a flat surface

Dont bang it

Carry it with 2 HANDSone on the arm and the other on the base

Carry a Microscope Correctly

Using a MicroscopeStart on the lowest magnificationDont use the coarse adjustment knob on high magnificationyoull break the slide!!!Place slide on stage and lock clipsAdjust light source (if its a mirrordont stand in front of it!)Use fine adjustment to focus

Referenceshttp://www.cerebromente.org.br/n17/history/neurons1_i.htmGoogle Imageshttp://science.howstuffworks.com/light-microscope1.htm

This powerpoint was kindly donated to www.worldofteaching.com

http://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching.

***************************