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WorksheetsI AM Magnification & Image Size
Total questions: 12
Worksheet time: 52mins
How many microns μm = 1 mm?
1,000
1,000,000
10,000
100,000
To calculate magnification of an electron micrograph we use......
magnification = image size x actual size
magnification = image size ÷ actual size
magnification = actual size ÷ field of view
magnification = ocular lens x objective lens
To calculate the image size of an electron micrograph if we use.....
Image size = Actual size x Magnification
Image size = Magnification ÷ Actual size
Image size = Actual size ÷ magnification
Image size = Magnification x Actual size
Josie measured the scale bar image to be 80 mm. What is the Magnification of this electron micrograph?
I = AM
160X
0.00625 X
0.16X
25,000X
If the scale bar measures 60 mm and the actual size it represents is 30 μm , what is the magnification?
2,000X
150X
5,000X
20X
If a scale bar measures 32 mm and it states it's length is 100 μm, what is the magnification?
320 x
3,200 x
0.32 x
32,000 x
Serena measured the image of one of the bacterial cells to be 32 mm. If the magnification of the image is 8,000X, what is the actual size of the bacterial cell?
4 μm
0.004 μm
256,000 μm
0.25 μm
What steps should Burt use follow to calculate the actual size of each bacterial cell?
Step 1: Calculate the magnification by measuring the scale bar image ÷ actual size
Step 2: Measure image of bacterial cell ÷ magnification
Step 1: Calculate the magnification by measuring the scale bar image x actual size
Step 2: Measure image of bacterial cell ÷ magnification
Step 1: Measure the image of the bacterial cell
Step 2: Divide the image size by the scale bar size
He can't, it is impossible to calculate
The scale bar of measures 3 mm but its actual size is 50 nm. What is the magnification of this image?
Remember: 1 mm = 1,000,000 nm
60,000X
60X
600X
6,000X
Why do we not use light microscopes to see things as small as viruses?
We cannot get enough light through the lenses to be able to see it
Viruses are too big to be seen with a light microscope
Electron microscopes are cheaper to use
Light microscopes don't let us see in color
How would we calculate magnification of these images?
Calculate Field of View (FOV)
Measure the images with a ruler then multiply by 1,000
Look at the scale bar and see what magnification it says
Measure the scale bar with a ruler and use the I=AM formula
