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Do Now in JournalDo Now in Journal
• Title “What’s Hot: Cells” 4/6/09
Article Title:
Summary:
Text 2 self or
Text 2 world or
Text 2 text
4/6/09 What’s Hot: Cells4/6/09 What’s Hot: Cells
For your table group:
A. Get 4 articles in page protectors
B. Get 1 drawer from blue containers
C. Washer of page protectors
D. Put away drawer when finished
POD 4/6
1. What’s Hot
2. Finish with presenting your cells
3. Microscopes!
4. Look at cells!
Cell presentations
• You will be presenting your Cell analogies
• How much time do you need?
Learning how to use the microscopeLearning how to use the microscope
There are 2 kinds of microscopes:
Simple: one lensone lens (magnifyingmagnifying glass)
Compound: 2 or more lenses
Parts of the MicroscopeParts of the Microscope
1.1.NosepieceNosepieceBBHolds the Holds the HighHigh and and LowLow power power objective objective lenseslenses; can be ; can be rotated to rotated to change change magnificationmagnification
Parts of the MicroscopeParts of the Microscope
2. 2. Objective Objective LensesLenses
CC
Magnification Magnification ranges from ranges from 4x4x to to 40x40x
Parts of the MicroscopeParts of the Microscope
3. 3. StageStage
EE
Supports the Supports the slideslide being being viewedviewed
Parts of the MicroscopeParts of the Microscope
4. 4. DiaphragmDiaphragmHHRegulates the Regulates the
amount of amount of lightlight on a specimenon a specimen
(controls amount (controls amount of of light light on a on a slide)slide)
1 = 1 = lowestlowest setting/setting/
55 = = highest settinghighest setting
Parts of the MicroscopeParts of the Microscope
5. 5. Light sourceLight source
FF
Projects light Projects light upwardsupwards through the through the diaphragm, diaphragm, the the specimenspecimen, , and the and the lenseslenses
Parts of the MicroscopeParts of the Microscope
6. 6. BaseBase
GG
Supports the Supports the microscopemicroscope
Parts of the MicroscopeParts of the Microscope
7. 7. EyepieceEyepiece
AA
Contains the Contains the OcularOcular lens lens
Parts of the MicroscopeParts of the Microscope
8. 8. ArmArm
KK
Used to Used to support support the the microscope microscope when when carriedcarried
Parts of the MicroscopeParts of the Microscope
9. 9. Stage ClipsStage Clips
DD
HoldHold the slide the slide in placein place
Parts of the MicroscopeParts of the Microscope
10. 10. CourseCourse
Adjustment Adjustment KnobKnob
JJ
Moves the Moves the stage up and stage up and down for down for focusingfocusing
Parts of the MicroscopeParts of the Microscope
11. 11. FineFine
Adjustment Adjustment KnobKnob
II
Moves the Moves the stage slightly stage slightly to to sharpensharpen the imagethe image
Calculating Calculating MagnificationMagnification
MultiplyMultiply lens powers together! lens powers together!
What’s my power?
What are the powers of magnification for each of the objectives (letter C) we have on our microscopes?
• Eyepiece: 10 X by itself• Low Power: 4X• Eyepiece x Lens = Total Power
• Power = 10 x 4 = 40Power = 10 x 4 = 40• mainly used for large objects/scanninglarge objects/scanning
• Medium Power: 10 X• Eyepiece x Lens = Total Power• Power = 10 x 10 = 100Power = 10 x 10 = 100
• High Power: 40 X• Eyepiece x Lens = Total Power• Power = 10 x 40 = 400Power = 10 x 40 = 400• mainly used for smaller objects/detailsmainly used for smaller objects/details
Safety InstructionsSafety Instructions
Make sure it is on LOWLOW power! (smallest objective)
The stage should be all the way downdown (you focus by slowly moving it up!)
Don’t touch the lens of the microscope with your hands
Carrying the Microscope:
•Always hold in Always hold in an an uprightupright positionposition
•Always Always use 2 use 2 hands!hands!
•Never carry by Never carry by the the eyepieceeyepiece
Other Things to Other Things to Consider:Consider:
•Never use the COURSE FOCUS KNOB while on HIGHHIGH power.
•Why? You could break the lens!
• Sometimes there is not enough room!• only use the fine adjustment on high power
TROUBLESHOOTINGTROUBLESHOOTINGWhat if you can’t get your object What if you can’t get your object
into focus?into focus?
•Check that you have one of the lenses clicked into place
•Check that your disc diaphragm is in place (not IN IN BETWEENBETWEEN settings)
TROUBLESHOOTINGTROUBLESHOOTINGWhat if you can’t get your object What if you can’t get your object
into focus?into focus?
• Clean off your lenses using LENS PAPERLENS PAPER. (Not Kleenex tissue)
• GO BACK TO LOW POWER AND START OVER!
When putting the When putting the microscope away (at the microscope away (at the
end of the class):end of the class):It should be on LOWLOW power.The cord should be WRAPPEDWRAPPED
around the base.The stage should be all the way
DOWNDOWN (do this with the course focus knob!)
Put the dust cover back on• Put carefully back on cart • Check microscope into the teacher
Let’s Try it out!In Journal: title “Microscope Drawing 4/3”
– Draw what you see after focusing the image– Label the image (what is it called)– Label magnification (power) on drawing
For example:
Onion cell
Power = 10 x 40 = 400
Group roles:
1. Carefully go get a microscope
2. Get a slide on back table
3. Clear off desks completely
4. Clean up duty