# What is the formula for Actual Size and Magnification?

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#1
..and also what's the unit? Thanks...
2
15 years ago
#2
Not sure about the units but the formula is

Magnification = measured size/actual size

I always remeber it as magma
6
15 years ago
#3
Magnification = size of image/ actual size of object

Magnification doesn't have units. The size of the image you usually measure in mm but covert into micrometres or nanometres to work out the actual size.
2
#4
Thanks guys!

Pink_Sparkles : how do you convert it? so before I divide the image size by actual size I need to convert it first? I don't know which one to convert...is it the magnification, actual size or image size?
0
15 years ago
#5
Right, I looked at a question and it says work out the magnification, with the actual length being 0.8mm

So, you need to measure the picture and convert the units to mm too
0
15 years ago
#6
I think there is 1000nm to 1mm.
0
15 years ago
#7
1 x 10^9 nm = 1 m

1 m = 100 cm = 1000 mm

so 1 x 10^9 nm = 1000 mm
and 1 mm = 1 x 10^6 nm = 1,000,000 nm.
1
15 years ago
#8
You need to make sure the size of the image and the actual size are both in the same units before you divide to find magnification. For example, if the actual size is 5 micrometres and you measure the image to be 40mm. Convert the mm to micrometres (x by 1000). So, 40000/5 = 8000. The magnfication is x 8000
1
#9
Thank you very much to all!!! =)
1
8 years ago
#10
Should we calculate with scale that is given below in the drawing ?
0
6 years ago
#11
(Original post by Danish.97)
Should we calculate with scale that is given below in the drawing ?
YES!
0
5 years ago
#12
What does actual lenght mean plz reply now
0
5 years ago
#13
(Original post by aleshaba)
What does actual lenght mean plz reply now
You are aware that this thread is over 10 years old?

I don't quite get what you don't understand about actual length. It means how long it is.
0
5 years ago
#14
How do you find the actual size when u are only given the magnification??
0
5 years ago
#15
(Original post by paperheart)
..and also what's the unit? Thanks...
measured/actual
i remember it as MAgnification where M stabds for measured and A is actual
the unit for magnification is times as in multiplication
0
4 years ago
#16
Cool
0
4 years ago
#17
How you work out or measure the size of the magnified object?
0
3 years ago
#18
how do you calculate the real image size? is it image size divided by magnification?
0
3 years ago
#19
how do you calculate real size? is it image size divided by magnification?
0
3 years ago
#20
yep
2
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