What are these images?
Man-Made Ice
Planet Jupiter
Taste Buds
(Human Tongue)
Dust Mite
(Bed Bug)
Human Hair
Date
Magnification
Learning Objective (LO)
L4+ Use a formula to calculate magnification
Success Criteria (SC)
L3+ I can compare magnified images.
L4+ I can calculate magnification with same units.
L5+ I can calculate magnification with different units.
Key Words
Magnification, Image, Microscope, Rank.
Questions
How might it be possible to see images of objects
that are very small?
How might maths be used in the study of
magnified images?
Magnification
Study the eight images of objects. Most of them
can only be seen when magnified by a light
microscope or electron microscope.
Task 1
Rank the images in order from smallest to largest.
You will now view the an animation from cellsalive
to check your order.
How big?
The animation showed different scales of
measurement:
1mm = 1000µm
(micrometers)
1cm = 10mm
How many µm in 1cm?
Rearrange these to find the formula
for working out magnification
L4+ I can calculate magnification with same units.
Easier – Same units of measurement
20 ÷ 0.002 =
x10,000
Object
Image Size
Actual size
E Coli
20mm
0.002mm
x
Yeast Cell
10mm
0.006mm
x
Blood cell
300mm
0.01mm
x
Pollen Grain
40mm
0.5mm
Hair
6cm
3.5cm
x30,00
6 x÷ 3.5 =
xx1.7
40 ÷ 0.5 =
x80
15mm ÷
0.003mm =
x50
Magnification
Difficult – Different units of measurement
Object
Image Size
Actual size
Salmonella
1.5cm
0.003mm
x
Crystal
3cm
0.05mm
x
White Cell
20mm
20µm
x
Dust
25mm
0.1cm
x
Finger Nail
5mm
1.5cm
x
5mm ÷
2015mmm
= x0.3
10 ÷ 0.006 =
x1,666.67
Magnification 300 ÷ 0.0
30mm ÷
0.05mm =
x600
25mm ÷
201mmm
= x25
20,000µ ÷
2020µm
= x1000
Questions
Which calculation was the odd one out and why?
Which calculation has the largest magnification?
What careers may involve working with
magnification of objects?
Progress
Write down one thing that has
helped you be successful in today's
lesson
Write down one thing that you
need to do to improve
Easier – Same units of measurement
Object
Image Size
Actual size
Magnification
E Coli
20mm
0.002mm
x
Yeast Cell
10mm
0.006mm
x
Blood cell
300mm
0.01mm
x
Pollen Grain
40mm
0.5mm
x
Hair
6cm
3.5cm
x
Difficult – Different units of measurement
Object
Image Size
Actual size
Magnification
Salmonella
1.5cm
0.003mm
x
Crystal
3cm
0.05mm
x
White Cell
20mm
20µm
x
Dust
25mm
0.1cm
x
Finger Nail
5mm
1.5cm
x