Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 4 Tools and Techniques Chapter 1 Objectives List the function.

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Presentation transcript:

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 4 Tools and Techniques Chapter 1 Objectives List the function of each of the major parts of a compound microscope. Compare two kinds of electron microscopes. Describe the importance of having the SI system of measurement. State some examples of good laboratory practice.

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 4 Tool and Techniques Chapter 1 Microscopes as Tools Light Microscopes –A compound light microscope is a microscope that shines light through a specimen and has two lenses to magnify an image. –Four major parts of a compound light microscope are the ocular lens, objective lens, stage, and light source.

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 4 Tool and Techniques Chapter 1 Microscopes as Tools Light Microscopes –The eyepiece magnifies the image. –The objective lens enlarges the specimen. –The stage is a platform that supports slides with specimens. –The light source is a light bulb that provides light for viewing images.

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 4 Tool and Techniques Chapter 1 Microscopes as Tools, continued Magnification and Resolution –Magnification is the increase of an object’s apparent size. –Resolution is the power to show details clearly in an image.

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 4 Tool and Techniques Chapter 1 Object Size and Magnifying Power of Microscopes

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 4 Tool and Techniques Chapter 1 Microscopes as Tools, continued Electron Microscopes –In an electron microscope, a beam of electrons produces an enlarged image of the specimen. –Electron microscopes provide greater magnification and resolution than light microscopes.

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 4 Tool and Techniques Chapter 1 Microscopes as Tools, continued Electron Microscopes –Scanning electron microscopes pass a beam of electrons over the specimen’s surface for better viewing the external surface of a specimen. –Transmission electron microscopes transmit a beam of electrons through a thinly sliced specimen for better viewing the internal structures of a specimen.

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Microscope Quiz 1.What type of microscope shines light through a specimen? 2.What are the four major parts of a light microscope? 3.How do you hold the microscope when you have to carry it?

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Quiz Cont’d 4.What is the name of the first objective that you use when trying to locate a specimen under the microscope? 5.What do you use to secure the slide to the stage? 6.Which adjustment knob raises and lowers the stage?

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Quiz Cont’d 7.Do you use the course adjustment knob to focus on an object under high power? Why? 8.What does the diaphragm do? 9.The thin black line that you can see when you look into the microscope is used for ______________. 10.What is the total magnification when viewing a specimen through the low power (10x) objective?