t. trimpe 2005 - denton isd
TRANSCRIPT
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T. Trimpe 2005
http://sciencespot.net/
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Body Tube
Nosepiece
Objectives
Stage Clips
Light
Ocular lens
(Eyepiece)
Arm
Stage
Coarse Adjustment
Fine Adjustment
Always carry a microscope with one hand
holding the arm and one hand under the base.
Base
Diaphragm
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MICROSCOPE
• Arm - this attaches the eyepiece and body tube to the base.
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Base - this supports the microscope.
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Body tube - the tube that supports the eyepiece.
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Coarse focus adjustment - a knob that makes large adjustments to the focus.
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Diaphragm - an adjustable opening under the stage, allowing different amounts of light onto the stage.
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Eyepiece - where you place your eye.
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Fine focus adjustment - a knob that makes small adjustments to the focus (it is often smaller than the coarse focus knob).
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High-power objective - a large lens with high magnifying power.
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Inclination joint - an adjustable joint that lets the arm tilt at various angles.
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Low-power objective - a small lens with low magnifying power.
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Mirror (or light source) - this directs light upwards onto the slide.
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Revolving nosepiece - the rotating device that holds the objectives (lenses).
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Stage - the platform on which a slide is placed.
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Stage clips - metal clips that hold a slide securely onto the stage
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What’s my power?
To calculate the power of magnification, multiply the power of the
ocular lens by the power of the objective.
What are the powers of
magnification for each of
the objectives we have on
our microscopes?
Fill in the table on
your worksheet.
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Comparing Powers of Magnification
We can see better details with higher the
powers of magnification, but we cannot see
as much of the image.
Which of these images
would be viewed at a
higher power of
magnification?
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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.
4 – When you are done, turn off the microscope and put up the
slides you used.
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!