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

Microscopes by Brainpop