Microscope Revision

Microscope Revision
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Slide 1: Diapositive
ScienceLower Secondary (Key Stage 3)

Cette leçon contient 36 diapositives, avec quiz interactifs, diapositives de texte et 1 vidéo.

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Microscope Revision

Slide 1 - Diapositive

Cell membrane
Cell wall
Nucleus
Vacuole
Cytoplasm
Chloroplast
Mitochondria
Ribosome

Slide 2 - Question de remorquage

Structure
Function

Controls what enters and leaves the cell.
Contains DNA and controls the cell processes.
The site of respiration.
The site of chemical reactions in the cell.
Storing cell sap and keeping the cell rigid.
The site of photosynthesis. Contains chlorophyll.
Protects and supports the cell.
Protein synthesis (making proteins).
Cell membrane
Chloroplast
Cell wall
Vacuole
Mitochondria
Nucleus
Cytoplasm
Ribosome

Slide 3 - Question de remorquage

Click on each hotspot to learn more.
Eye Piece Lens
The eye piece lens is the part of the microscope that you look through to see the image. It usually has a low magnification (x10).
Objective Lens
There are 3 objective lenses, each with a different strength of magnification. Combined with the eye piece lens they will make the image many times bigger than its actual size. When using them, we always start on the lowest powered lens and rotate through to the highest power.
Stage
This is the flat section of the microscope that we will place the slide on. There are clips to hold the slide in place. Always start with the stage lowered as far from the objective lens as possible.
Coarse Focus Wheel
Turning the coarse focus wheel moves the stage closer/further from the objective lens. When looking at a slide, start with the stage lowered and then turn the coarse focus wheel until an image appears/comes into focus when looking through the eye piece lens.
Fine Focus Wheel
The fine focus wheel is used to make small adjustments to the clarity of an image. Once you have used the coarse focus wheel to bring the image into view, carefully turn the fine focus until the image is perfectly clear. 

Slide 4 - Diapositive

We use microscopes to magnify small objects that we cannot see with the naked eye.
You need to know the different parts of a microscope and how to use one correctly.

Slide 5 - Diapositive

Label the microscope.
Objective lens
Fine focus wheel
Coarse focus wheel
Eye piece lens
Stage
Light

Slide 6 - Question de remorquage

Which part of the microscope is missing?
A
Objective Lens
B
Eye Piece Lens
C
Coarse Focus Wheel
D
Fine Focus Wheel

Slide 7 - Quiz

Which part of the microscope is missing?
A
Objective Lens
B
Eye Piece Lens
C
Coarse Focus Wheel
D
Fine Focus Wheel

Slide 8 - Quiz

Which 2 parts of the microscope magnify an image?
A
Objective Lens
B
Eye Piece Lens
C
Coarse Focus Wheel
D
Fine Focus Wheel

Slide 9 - Quiz

Match the part of the microscope to its function.
The part that you look through. Magnifies the image at a low power.
Magnifies the image, starting from the lowest power and moving higher.
The platform the slide is placed on.
Moves the platform up and down to bring the slide into focus.
Makes small adjustments so that the image is completely clear.
Stage
Objective lens
Coarse focus
Fine focus
Eye piece lens

Slide 10 - Question de remorquage

What problem might you have if the fine focus wheel was broken?

Slide 11 - Question ouverte

A student's microscope image looks like this. What could they do to make it clearer?

Slide 12 - Question ouverte

A student's microscope image looks like this. What could they do to make it clearer?

Slide 13 - Question ouverte

To get a clear view of an image, you must follow the steps of using a microscope in the correct order:

Slide 14 - Diapositive

Put the steps for viewing an image in the correct order.
Place the object you wish to observe on the stage.
Select the objective lens with the lowest magnification and look through the eyepiece.
Turn the fine focus knob until the object comes into focus.
Turn the coarse focus knob until you can see your object.
Move the stage to its lowest position.
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 2
 3
 4
 5

Slide 15 - Question de remorquage

A student has a leaf that they would like to look at under a microscope. Write a step-by-step method to help the student get a clear, magnified picture of their leaf.

Slide 16 - Question ouverte

1. If you know the power of the eye piece lens and the objective lens:
Total magnification = Eye piece lens x Objective lens
e.g. if the eyepiece is x10 and the objective is x40

Total magnification = 10 x 40
                                      = x400

Slide 17 - Diapositive

Calculate the total magnification when the eyepiece lens is x20 and the objective lens is x100

Slide 18 - Question ouverte

Calculate the total magnification when the eyepiece lens is x10 and the objective lens is x50

Slide 19 - Question ouverte

Calculate the total magnification when the eyepiece lens is x10 and the objective lens is x20

Slide 20 - Question ouverte

Test yourself: can you get 100% on challenge mode?

Slide 21 - Diapositive

Slide 22 - Vidéo

Light microscopes vs. Electron microscopes

Slide 23 - Carte mentale

1. If you know the size of the image and the size of the actual object.
Total magnification = Image size  ÷  Actual size
e.g. if the image is 500mm and the object is 25mm

Total magnification = 500  ÷  25
                                      = x20

Slide 24 - Diapositive

Calculate the total magnification when the image is 250mm and the object is 25 mm

Slide 25 - Question ouverte

Calculate the total magnification when the image is 2600mm and the object is 130mm

Slide 26 - Question ouverte

Sometimes the image size and actual size will be given in different units. Before you can calculate magnification, both must be converted to the same unit e.g. millimetres.
To convert from micrometres to millimetres, multiply by 1000.

Slide 27 - Diapositive

1 mm =
A
10μm
B
100μm
C
1000μm
D
0.1μm

Slide 28 - Quiz

27 mm =
A
270μm
B
2700μm
C
27000μm
D
0.27μm

Slide 29 - Quiz

Convert 0.5 mm into μm.

Slide 30 - Question ouverte

Convert 0.017 mm into μm.

Slide 31 - Question ouverte

Convert 300 μm into mm.

Slide 32 - Question ouverte

Convert 2400 μm into mm.

Slide 33 - Question ouverte

Calculate the magnification if the image of a cell is 14mm, but its actual size is 42μm

Slide 34 - Question ouverte

Calculate the magnification if the image of a cell is 3.6mm, but its actual size is 9μm

Slide 35 - Question ouverte

Calculate the magnification if the image of a cell is 2.4cm, but its actual size is 0.06mm

Slide 36 - Question ouverte