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1、The Microscope,Mr. Ryan6th Grade,The History,Many people experimented with making microscopesWas the microscope originally made by accident?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 Histor
2、y,Hans 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 Leeuwenhoek1632-1723,Robert Hooke 1635-1703,Hooke Microscope,The History,Zacharias Jansen1588-1631,The “First” M
3、icroscope,How a Microscope Works,Convex Lenses arecurved glass used to make microscopes(and glasses etc.),Convex Lenses bendlight and focus it inone spot.,How a Microscope Works,Ocular Lens(Magnifies Image),Objective Lens(Gathers Light, Magnifies And Focuses Image Inside Body Tube),Body Tube(Image F
4、ocuses),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 Tube,Nose Piece,ObjectiveLenses,Stage Clips,Diaphragm,Light Source,Ocular Lens,
5、Arm,Stage,Coarse Adj.,Fine Adjustment,Base,Skip to Magnification Section,Body Tube,The body tube holds the objective lenses and the ocular lens at the proper distance,Diagram,Nose Piece,The Nose Piece holds the objective lenses and can be turned to increase the magnification,Diagram,Objective Lenses
6、,The Objective Lenses increase magnification (usually from 10x to 40x),Diagram,Stage Clips,These 2 clips hold the slide/specimen in place on the stage.,Diagram,Diaphragm,The Diaphragm controls the amount of light on the slide/specimen,Turn to let more light in or tomake dimmer.,Diagram,Light Source,
7、Projects light upwards through the diaphragm, the specimen and the lensesSome have lights, others have mirrors where you must move the mirror to reflect light,Diagram,Ocular Lens/Eyepiece,Magnifies the specimen image,Diagram,Arm,Used to support the microscope when carried. Holds the body tube, nose
8、piece and objective lenses,Diagram,Stage,Supports the slide/specimen,Diagram,Coarse Adjustment Knob,Moves the stage up and down (quickly) for focusing your image,Diagram,Fine Adjustment Knob,This knob moves the stage SLIGHTLY to sharpen the image,Diagram,Base,Supports the microscope,Diagram,Magnific
9、ation,Magnification,To determine your magnificationyou just multiply the ocular lens by the objective lensOcular 10x Objective 40x:10 x 40 = 400,Objective Lens have their magnificationwritten on them.,Ocular lenses usually magnifies by 10x,So the object is 400 times “larger”,Caring for a Microscope,
10、Clean only with a soft cloth/tissueMake sure its on a flat surfaceDont bang itCarry it with 2 HANDSone on the arm and the other on the base,Carry a Microscope Correctly,Using a Microscope,Start on the lowest magnificationDont use the coarse adjustment knob on high magnificationyoull break the slide!
11、Place slide on stage and lock clipsAdjust light source (if its a mirrordont stand in front of it!)Use fine adjustment to focus,References,http:/www.cerebromente.org.br/n17/history/neurons1_i.htmGoogle Imageshttp:/ powerpoint was kindly donated to http:/ 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.,
