Do Now Copy down your homework in your

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Do Now /Copy down your homework in your agenda – EROSION PROJECT DUE MONDAY

Do Now /Copy down your homework in your agenda – EROSION PROJECT DUE MONDAY 11/18/13 /Work with your group to label the parts of the microscope using the word bank on the group worksheet

Structure & Function of the Microscope

Structure & Function of the Microscope

Objectives /Identify the various parts of a microscope and define their purpose /Calculate the

Objectives /Identify the various parts of a microscope and define their purpose /Calculate the power of magnification /Use a diagram to distinguish between the powers of magnification

Parts of a microscope •

Parts of a microscope •

Parts of a microscope /A. Eyepiece /Contains the OCULAR lens •

Parts of a microscope /A. Eyepiece /Contains the OCULAR lens •

Parts of a microscope /B. Nosepiece /Holds the HIGHand LOW-power objective LENSES; can be

Parts of a microscope /B. Nosepiece /Holds the HIGHand LOW-power objective LENSES; can be rotated to change MAGNIFICATION •

Parts of a microscope /C. Objective Lenses /Magnification ranges from 10 X to 40

Parts of a microscope /C. Objective Lenses /Magnification ranges from 10 X to 40 X Long= High Power Short = Low Power •

Parts of a microscope /D. Stage Clips /HOLD the slide in place •

Parts of a microscope /D. Stage Clips /HOLD the slide in place •

Parts of a microscope /E. Stage /Supports the SLIDE being viewed •

Parts of a microscope /E. Stage /Supports the SLIDE being viewed •

Parts of a microscope /F. Light Source /Projects light UPWARDS through the diaphragm, the

Parts of a microscope /F. Light Source /Projects light UPWARDS through the diaphragm, the SPECIMEN and the LENSES •

Parts of a microscope /G. Base /Supports the MICROSCOPE •

Parts of a microscope /G. Base /Supports the MICROSCOPE •

Parts of a microscope /H. Diaphragm /Regulates the amount of LIGHT on the specimen

Parts of a microscope /H. Diaphragm /Regulates the amount of LIGHT on the specimen •

Parts of a microscope /I. Fine Adjustment Knob /Moves the stage slightly to SHARPEN

Parts of a microscope /I. Fine Adjustment Knob /Moves the stage slightly to SHARPEN the image •

Parts of a microscope /J. Coarse Adjustment Knob /Moves the stage up and down

Parts of a microscope /J. Coarse Adjustment Knob /Moves the stage up and down for FOCUSING •

Parts of a microscope /K. Arm /Used to SUPPORT the microscope when carried •

Parts of a microscope /K. Arm /Used to SUPPORT the microscope when carried •

Think Pair Share /Why is it important to know and understand how to use

Think Pair Share /Why is it important to know and understand how to use all the parts of a microscope?

Rules of Handling and Using a Microscope /Always carry with 2 hands /Only use

Rules of Handling and Using a Microscope /Always carry with 2 hands /Only use lens paper for cleaning /Do not force knobs /Always store covered /Be careful with the cords

Magnification /A microscope magnifies the object or slide on the stage using the eyepiece

Magnification /A microscope magnifies the object or slide on the stage using the eyepiece and objective /To calculate the magnification multiply the eyepiece magnification (10 X) by the objective magnification (4 X, 10 X, 40 X)

Example What happens as the power of magnification increase?

Example What happens as the power of magnification increase?

Comparing Powers of Magnification /We can see better details with higher powers of magnification,

Comparing Powers of Magnification /We can see better details with higher powers of magnification, but we cannot see as much of the image

Think Pair Share /Which of these images is viewed at a higher power of

Think Pair Share /Which of these images is viewed at a higher power of magnification? Explain how you can tell. Slide 1 Slide 2

How to Use a Microscope /Place the slide on the stage /Use stage clips

How to Use a Microscope /Place the slide on the stage /Use stage clips to secure slide /Adjust nosepiece to lowest setting /(Lowest /Look = shortest objective) into eyepiece /Use coarse adjustment knob to focus the slide /Use the fine adjustment knob to sharpen the focus

Let’s give it a try. . . 1 – Turn on the microscope and

Let’s give it a try. . . 1 – Turn on the microscope and then rotate the nosepiece to click the red-banded objective into place. 2 – Place a slide on the stage and secure it using the stage clips. Use the coarse adjustment knob (large knob) to get it the image into view and then use the fine adjustment knob (small knob) to make it clearer. 3 – Once you have the image in view, rotate the nosepiece to view it under different powers. Draw what you see on your worksheet! Be careful with the largest objective! Sometimes there is not enough room and you will not be able to use it! 4 – When you are done, turn off the microscope and put up the slides you used.

How to make a wet-mount slide … 1 – Get a clean slide and

How to make a wet-mount slide … 1 – Get a clean slide and coverslip from your teacher. 2 – Place ONE drop of water in the middle of the slide. Don’t use too much or the water will run off the edge and make a mess! 3 – Place the edge of the cover slip on one side of the water drop. 4 - Slowly lower the cover slip on top of the drop. Cover Slip Lower slowly 5 – Place the slide on the stage and view it first with the red-banded objective. Once you see the image, you can rotate the nosepiece to view the slide with the different objectives. You do not need to use the stage clips when viewing wet-mount slides!