U2 The microscope 1HVTTO

• Biologie
• Middelbare school
• havo, vwo
• Leerjaar 1

The microscope

• Put your things on your desk

       Book, Notebook, Pencil case

• Bag on the floor
• Read pgs. 137 t/m 138

Lessongoals

• You can name all parts of a microscope
• You know how to use a microscope

Today

• Parts of a microscope
  
• Using a microscope
• Time for homework
  
• End

A microscope magnifies objects.
What does that mean?
Explain in English

stage clips

large knob

small knob

diaphragm

eyepiece

revolving nosepiece

bulb/lamp

stage

arm

objective lens

tube/barrel

Magnification

• Eyepiece : 10x
• Objective lenses

          Red: 4x

          Yellow: 10x

          Blue: 40x

• Total magnification = eyepiece x objective lens

You're using a microscope
The eyepiece magnifies 5x
The objective lens magnifies 40x.
What is your total magnification? (only enter a number)

Slide

Coverslip

Specimen

Getting ready

1. Use the arm and  base to hold the microscope.
2. Red lens above the stage.
3. Make sure the stage is as low as possible
4. Bulb turned on
5. Diaphragm open

Using the microscope

1. Put the specimen underneath the stage clips on the stage
2. Keep turning the large knob, while looking through the eyepiece, until the image is in focus.
3. You have magnified your object 40x 
4. Rotate to the yellow lens
5. Keep turning the small knob until the image is in focus.
6. You have magnified your object 100x
7. Rotate to the blue lens
8. Keep turning the small knob until the image is in focus.
9. You have magnified your object 400x

Tidying up

1. Red lens above the stage
2. Make sure the stage is as low as possible
3. Remove the specimen.
4. Bulb turned off
5. Use the arm to hold the microscope

What you should do:

• Read pages  137-141
• Do asgmt  1,2,3 pgs. 139, 141

Done with the above?

• Work on the next chapter(s)
• Learn for the test 
• Make other homework
• Read a book

Zs = Working in Silence

• No asking questions
• Silent, don't disturb anyone
  
• Stay at your  desk

What you should do:

• Read pages 137-141
  
• Do asgmt 1,2,3 pgs. 139, 141

Done with the above?

• Work on the next chapter(s)
• Learn for the test 
• Make other homework
• Read a book

Zw = Working with whispering

• Teacher is available for questions
• Only whisper with the student next to you
• Stay at your  desk

Tidy Duty

Today these people are on tidy duty

• Desks: empty and straight
• Chairs:  underneath the desks
• Floor: no rubbish