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The Microscope PowerPoint Presentation

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The Microscope Presentation Transcript

Slide 1 - The Microscope Mr. Ryan 6th Grade
Slide 2 - The History Many people experimented with making microscopes Was the microscope originally made by accident?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.
Slide 3 - The History Hans and Zacharias Janssen of Holland in the 1590’s created the “first” compound microscope Anthony van Leeuwenhoek and Robert Hooke made improvements by working on the lenses Anthony van Leeuwenhoek 1632-1723 Robert Hooke 1635-1703 Hooke Microscope
Slide 4 - The History Zacharias Jansen 1588-1631 The “First” Microscope
Slide 5 - How a Microscope Works Convex Lenses are curved glass used to make microscopes (and glasses etc.) Convex Lenses bend light and focus it in one spot.
Slide 6 - How a Microscope Works Ocular 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).
Slide 7 - The Parts of a Microscope
Slide 8 - Body Tube Nose Piece Objective Lenses Stage Clips Diaphragm Light Source Ocular Lens Arm Stage Coarse Adj. Fine Adjustment Base Skip to Magnification Section
Slide 9 - Body Tube The body tube holds the objective lenses and the ocular lens at the proper distance Diagram
Slide 10 - Nose Piece The Nose Piece holds the objective lenses and can be turned to increase the magnification Diagram
Slide 11 - Objective Lenses The Objective Lenses increase magnification (usually from 10x to 40x) Diagram
Slide 12 - Stage Clips These 2 clips hold the slide/specimen in place on the stage. Diagram
Slide 13 - Diaphragm The Diaphragm controls the amount of light on the slide/specimen Turn to let more light in or to make dimmer. Diagram
Slide 14 - Light Source Projects light upwards through the diaphragm, the specimen and the lenses Some have lights, others have mirrors where you must move the mirror to reflect light Diagram
Slide 15 - Ocular Lens/Eyepiece Magnifies the specimen image Diagram
Slide 16 - Arm Used to support the microscope when carried. Holds the body tube, nose piece and objective lenses Diagram
Slide 17 - Stage Supports the slide/specimen Diagram
Slide 18 - Coarse Adjustment Knob Moves the stage up and down (quickly) for focusing your image Diagram
Slide 19 - Fine Adjustment Knob This knob moves the stage SLIGHTLY to sharpen the image Diagram
Slide 20 - Base Supports the microscope Diagram
Slide 21 - Magnification
Slide 22 - Magnification To determine your magnification…you just multiply the ocular lens by the objective lens Ocular 10x Objective 40x:10 x 40 = 400 Objective Lens have their magnification written on them. Ocular lenses usually magnifies by 10x So the object is 400 times “larger”
Slide 23 - Caring for a Microscope Clean only with a soft cloth/tissue Make sure it’s on a flat surface Don’t bang it Carry it with 2 HANDS…one on the arm and the other on the base
Slide 24 - Carry a Microscope Correctly
Slide 25 - Using a Microscope Start on the lowest magnification Don’t use the coarse adjustment knob on high magnification…you’ll break the slide!!! Place slide on stage and lock clips Adjust light source (if it’s a mirror…don’t stand in front of it!) Use fine adjustment to focus
Slide 26 - References http://www.cerebromente.org.br/n17/history/neurons1_i.htm Google Images http://science.howstuffworks.com/light-microscope1.htm
Slide 27 - 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.