Calculating Magnification

Question 1

To find the magnification of a microscope image, what do we need to do in order to do this?

Answer 1

We use the magnification formula

Question 2

What is the magnifiction formula?

Answer 2

MAGNIFICATION = IMAGE SIZE / ACTUAL SIZE

Question 3

If an image of a cell is 10cm and an actual cell is 0.1cm, what is the magnification of the microscope?

Answer 3

M = 10/0.1 -> 100x

Question 4

The size of the actual object is magnified to become…

Answer 4

larger in the image

Question 5

If the image is 3 times bigger than the actual object…

Answer 5

the magnification will be 3x (that’s bsc the same as saying magnification = image size / actual size)

Question 6

How do you calculate magnification?

Answer 6

Using the magnification formula

Question 7

Step 1: Write out the magnification formula

Answer 7

MAGNIFICATION = IMAGE SIZE / ACTUAL SIZE

UNITS MUST BE THE SAME

Question 8

Step 2: Convert the image and actual size into the same units

Answer 8

Example:
IMAGE: 1CM ACTUAL: 10μm

μm -> cm
there are 1000μm in 1mm
we need to convert mm to cm so there is 10mm in 1cm

SO, 10/10,000 = 0.0001cm

10μm = 0.0001cm

Question 9

Step 3: Substitute numbers into the equation

Answer 9

M = I/A -> 1cm/0.0001cm = x10,000

Question 10

What is an easy way to rearrange the magnification formula?

Answer 10

By drawing a triangle

Question 11

We cover up what we want to find out and…

Answer 11

use the triangle to find the formula

Question 12

If we want to find the image size we cover the…

Answer 12

“I” and find that this is actual size x magnification

Question 13

Example for triangle to find the formula: If the image size is 5cm, and the magnification is 2,000, what is the actual size of the image?

Answer 13

Step 1: Use the triangle to find the formula for the actual image size

Question 14

Step 2 for using the triangle to find the formula: Substitute in the numbers

Answer 14

I/M 
I = 5cm 
M = 2000
5/2000 
ACTUAL IMAGE SIZE = 0.0025cm

Question 15

Step 3 for using the triangle to find the formula: Convert into appropriate units

Answer 15

Bring the decimal point more to the right, in which this case of 0.0025cm we will multiply this by 10,000

0.0025 x 10,000 = 25μm