Transcript Microscopes
Get Started 11/21: What is a microscope and what is it used for? What do you think the difference between a regular and compound microscope is? Microscopes Cells Goal 1 A microscope is a tool that is used to magnify the features of an object. A compound microscope has two or more lenses. PARTS OF THE MICROSCOPE EYEPEICE- lens contains the 10X magnifying PARTS OF THE MICROSCOPE Coarse adjustment knob/focus—focuses the image under low power PARTS OF THE MICROSCOPE Fine adjustment knob/focus—focuses the image under high power PARTS OF THE MICROSCOPE Objective lenses—two or three separate lenses that contain different powers of magnifying lenses PARTS OF THE MICROSCOPE Stage and stage clips—supports and hold the microscope slide in place while viewing PARTS OF THE MICROSCOPE Diaphragm— controls the amount of light that comes through the stage PARTS OF THE MICROSCOPE Light source —a mirror, external or internal light source that shines light through the object being viewed PARTS OF THE MICROSCOPE Arm— supports the body tube which connects the eyepiece to the set of objective lenses PARTS OF THE MICROSCOPE Base —supports the microscope Go to Edmodo! Click on the link to the Interactive Microscope. -Read about the different specimens with a partner and answer the questions together on the back of your Microscope Basic Notes. -Click on “What is a Microscope?” to Complete your Microscope Basics notes. Exit Slip-Essential Questions What is a compound microscope? Why do scientists use compound microscopes? Get Started 11/22 Take out your Microscope Basics Worksheet 1. Flip to the back page: What was the most interesting fact you learned yesterday when you read about each specimen? Be prepared to share! HOW TO USE THE MICROSCOPE 1. When looking through a microscope, the lighted area is the field of view. 2. Adjust the diaphragm until enough light is available. To make the field of view brighter, open the diaphragm. To make the field of view darker, close the diaphragm. HOW TO USE THE MICROSCOPE 3. Look through the eyepiece and first focus on the lowest power objective lens. Then change to the highest power objective lens if necessary. When focusing the image under low power objective, use the coarse adjustment knob. 4. Use only the fine adjustment knob to sharpen the focus when using the high power objective. TOTAL MAGNIFICATION To calculate total magnification, multiply the magnification of the eyepiece times the magnification of the objective lens being used. EYEPIECE X OBJECTIVE = TOTAL MAGNIFICATION Example: Eyepiece = 10 x Objective = 40 x Total Magnification: (10x) X (40x) = 400x MOVING THE SPECIMEN Objects on the slide move in the opposite direction For example, if the slide is moved to the left, the object being viewed appears to move to the right CARE OF A MICROSCOPE A microscope should be held and carried with one hand under the base and one hand on the arm. Some microscopes may have a mirror as the light source. Care should be taken not to aim the mirror directly at the Sun. Go to Edmodo! Complete the Microscope Web Quest Make a copy Place in Science Folder You may work with a partner for this activity Finish early? There are two links at the bottom of the Web Quest. Try ‘em out to help you study-Remember you have a microscope quiz on Monday! To participate in lab/handle the microscopes you must score 80% or higher on the quiz.