U2 The microscope 1HVTTO

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

The microscope

• Make sure to grab a pencil and an eraser

• Bag in the back of the classroom

Lessongoals

• You can name the parts of a microscope
• You know how to prepare a microscope slide
• You know how to use a microscope

Today

• Parts of a microscope
  
• Using a microscope
• End

stage clips

large knob

small knob

diaphragm

eyepiece

revolving nosepiece

lightbulb

stage

arm

objective lens

tube

Parts of a microscope

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

Slide

Coverslip

Specimen

How to make a microscope slide

1. Place one drop of liquid on middle of the slide.

2. Place specimen on middle of the slide.

3. Place cover slip over the specimen.

Make sure: 

- Don't use too much specimen or liquid

- Don't touch the parts of the slide and cover slip that you will be looking at!

Getting ready

1. Use the arm 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 until the image is in focus. with the RED lens
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

If at any point you can't focus, then you have to go back steps !!!

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 exercises 1,2,3 pages 139-141

Done with the above?

• Work on the next chapter(s)
• Learn for the test 
• Make other homework
• Read a book pages 110-115
• exercises 1-7 pages 110-114

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