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Premium member Presentation Transcript The Microscope 1 : The Microscope 1 Learning Outcomes : Learning Outcomes At the end of the lesson, you would be able to 1. name the parts of a microscope 2. observe slides under the microscope 3.calculate magnification of a specimen ? ? ? ? : ? ? ? ? What is a microscope & what is it used for? The Microscope : The Microscope Inclination joint Types of Microscope : Types of Microscope Dissecting Microscope Polarising microscope (for Geology/ petroleum work Stereo Microscope (view objects by each eye from 2 angles) Digital Microscope Cordless compound microscope (uses disposable batteries) Electron microscopes : Electron microscopes Slide 7: PARTS OF A MICROSCOPE The body tube : The body tube It holds the objective lenses and the ocular lens at the proper distance. Stage clips The 2 clips hold the slide/ specimen place on the stage The nose piece : The nose piece Holds the objective and can be turned to increases the magnification. Diaphragm Controls the amount of light on the slide/ specimen Objective lenses : Objective lenses Most microscopes have 2,3 or more Magnify at different powers Shortest lens always has the lowest power Increase magnification, usually from 10x to 40x Ocular Lens/ Eyepiece It is the lens at the top First lens you look through to see your specimen It magnifies the image Light source : Light source Projects light upwards through the diaphragm, the specimen and the lenses. Some have bulbs, others have mirrors. The mirrors are moved to direct and reflect the light The Arm Attach the eyepiece and the lenses Used to carry the microscope Use one hand to hold it and the other at the base of the microscope Inclination joint : Inclination joint - an adjustable joint that lets the arm tilt Stage The place where you put the specimen when you want to examine it. Base Supports the microscope The bottom of the microscope Coarse adjustment knob : Coarse adjustment knob The larger of the 2 knobs on the side of the microscope Moves the stage up and down QUICKLY, for focusing image Always use it first when focusing an image Fine Adjustment knob : Fine Adjustment knob The smaller round knob on the side of the microscope Used to fine tune the focus of your specimen after using the Coarse Adjustment knob Moves the stage SLIGHTLY to sharpen the image How does it work? : How does it work? It has convex lenses which are curved glasses. How does a microscope work? : How does a microscope work? The ocular lens magnifies the image The objective lens gathers light, magnifies and focuses image inside the tube The objective lens magnifies & focuses (bends) the image inside the body tube and the ocular convex lens magnifies it again LABEL THE PARTS OF THE MICROSCOPE ON THE SHEET : LABEL THE PARTS OF THE MICROSCOPE ON THE SHEET Care of the microscope NEVER : Care of the microscope NEVER 1. Always carry the microscope in an upright position with two hands. One hand should support the base and the other on the arm. NEVER Slide 20: 2.Make sure its on a clean, flat surface 3. Use lens paper and lens cleaning solution to clean the lenses on the microscope. Paper towel will scratch the lenses. Use a soft cloth to clean other parts of the microscope. NEVER 4. Always remove slides from the stage and rotate the nosepiece to the lowest power before returning the microscope to its storage area. Why? Microscope Magnification : Microscope Magnification Microscopes make the image of an object become bigger. This is called magnification To calculate the magnification, Magnification= Eyepiece lens power x objective lens This means the object (specimen) we are looking at has been magnified …….. times Eyepiece lens usually magnifies by 10x. TASK 2 : TASK 2 Find the magnification of these objects. 1.Eyepiece (Ocular) lens power = x10 Objective lens= x1000 2. Eyepiece lens power = x10 Objective lens power= x500 Drawing image of objects viewed : Drawing image of objects viewed Use a sharp pencil to draw clear straight lines NEVER USE A PEN TO DRAW Write the title Label the diagram Calculate the magnification and write at the bottom TASK 3 : TASK 3 Observe the image of the objects placed on the slide of the microscop and calculate their magnifications. Learning Outcomes : Learning Outcomes At the end of the lesson, you would be able to 1. name the parts of a microscope 2. observe slides under the microscope 3.calculate magnification of an object 4. You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.