Unit 2: Cells and Cell Structure

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Presentation transcript:

Unit 2: Cells and Cell Structure Microscope Basics Mrs. Hogue Biology Unit 2: Cells and Cell Structure

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#9 Eye Piece—The part you look at with your eye #9 Eye Piece—The part you look at with your eye. Usually 10 X magnification. Click Here to Return to the Main Slide

#10 Neck – Used to safely transport microscope Click Here to Return to the Main Slide

#11 Stage – Slides are placed on this Click Here to Return to the Main Slide

#12 Coarse Adjustment – Used to make large changes in focus #12 Coarse Adjustment – Used to make large changes in focus. NOTE Never use this when viewing on high power Click Here to Return to the Main Slide

#13 Fine Adjustment – Used to small adjustments of focus Click Here to Return to the Main Slide

#14 Base – Used to safely transport the microscope Click Here to Return to the Main Slide

#1 Tube – Reflects light up to the viewers eye Click Here to Return to the Main Slide

#2 Rotating Objects – Allows for quick change of objectives Click Here to Return to the Main Slide

#3 Low Power Objective – The first lens you use when doing proper microscope work. Usually 4 X Click Here to Return to the Main Slide

#4 Medium Power Objective – The second lens you use when doing proper microscope work. Usually 10 X Click Here to Return to the Main Slide

#5 High Power Objective – The highest magnification used. Usually 43 X #5 High Power Objective – The highest magnification used. Usually 43 X. NEVER use the course adjustment when using this lens. Click Here to Return to the Main Slide

#6 Stage Clips – Use to keep the slide in place. Click Here to Return to the Main Slide

#7 Diaphragm – Use to vary the amount of light passing through the slide. Usually it is better if the amount of light is low. Click Here to Return to the Main Slide

#8 Light Source – Sends light up through the diaphragm and through the slide for viewing Click Here to Return to the Main Slide

How a Light Microscope Works Slide # 7 Use lenses to make small objects appear larger Compound light microscope: Two lenses separated by a tube Lenses magnify an object by bending the light that passes through the lens Magnification: ability to make things appear larger than they are Resolution: fineness of detail that can be seen in an image Go to Section:

How to Prepare a Slide 1. Place slide on a flat surface. 2. Place a drop of water on the slide. Add the specimen to the drop of water (at times, you may want to have the specimen already on the slide before adding the water). 3. Hold the coverslip by its sides and lay its bottom edge on the slide close to the specimen. Holding the coverslip at a 45° angle helps. 4. Slowly lower the coverslip so that it spreads the water out. If you get air bubbles (looking like little black doughnuts), gently press on the coverslip to move them to the edge. If there are dry areas under the coverslip, add a little more water at the edge of the coverslip. Too much water can be dabbed off with a piece of paper towel

Slide # 9 How to Prepare a Slide The diagram below shows how a cover-slip should be lowered onto some single-celled organisms during the preparation of a wet mount. Why is this a preferred procedure? A The cover-slip will prevent the slide from breaking. B The organisms will be more evenly distributed. C The possibility of breaking the cover-slip is reduced. D The possibility of trapping air bubbles is reduced.