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Skills Lab 3 - SKILLS LAB 3 USING THE MICROSCOPE(BSB-218...

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SKILLS LAB 3: USING THE MICROSCOPE (BSB-218) You should complete this skills lab before attempting the microscope quiz on ELM! HOMEWORK: Before entering the lab, read about the history of the microscope on page 2 of your text book and be sure that you can identify the parts of the microscope! Parts of the light microscope: Study the following parts of the microscope. To begin this skill you will need to be able to identify parts of the microscope for the TA. 1. Ocular or eyepiece through which you look. Learn to leave both eyes open while working, to avoid eye fatigue. 2. Body tube . 3. Ocular turret which may be rotated through a full circle to allow infinite positions of the ocular. 4. Nosepiece with 3 or 4 different objectives, all of which are parfocal, i.e. the specimen should remain in focus as objectives are changed one to another, and require only minor adjustment of the fine focus at each change. 5. Objectives are the main working parts of any microscope - the compound lens system which produces the initial real specimen image. There are 4 objectives: low (4x), medium (10x), high (40x), and oil immersion (100x). 6. Arm - used to carry the microscope. Figure S3-1: Parts of the Microscope 7. Stage - upon which the slide with its specimen is placed. Adjustment of the stage height is the method of focusing. 8. Spring clip - used to hold the slide firmly in position. Spring clips DO NOT go over the slide, but rather press the slide into place from the sides. 9. Condenser - the lens mounted below the stage, which catches the light rays from their source and focuses them on the specimen. The condenser should not need adjustment, it should remain in its position just below its uppermost level. The condenser control knob is #12.
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