1.6 Microscopy - Calculations Flashcards
What is the equation for magnification
Magnification = image size / object size
What is magnification
How many times larger the image is than the object
What is the image size
How large the object appears when you view it through the microscope
What is the object size
The real size of the object appears
How would you rearrange the magnification equation to find the image size
Image size = magnification x object size
How would you rearrange the magnification equation to find the object size
Image size / magnification = object size
A plant cell in a photograph measures 40 mm in width. If the real width of the plant cell is actually 0.02 mm, what is the magnification?
magnification= image size/ object size
magnification= 40/0.02
x2000
The nucleus in a photograph of a cell measures 1.5 mm across. If the magnification in the photograph is × 500, what is the actual size of the nucleus?
(Give your answer in mm)
Magnification= image size/object size
Object size = image size/ magnification
1.5/500=0.003mm
Elouise finds a woodlouse that is 8 mm long. When she views it under the microscope it appears 12 cm long.
What is the magnification?
magnification= image size/object size
The units are different so we convert them: mm->cm -> 8/10=0.8
12/0.8= x15
A sperm cell is 5 μm long. How long will it appear when viewed under a microscope with a magnifying power of x1500?
(Give your answer in mm)
Magnification = image size/ object size
Image size= magnification x object size
Its looking for the answer to be in mm so we convert it μm->mm /1000
5/1000=0.005
0.005x1500=7.5mm
A human egg cell is roughly 100 μm wide.
How large would it appear when viewed under a microscope at x 60 magnification?
(Give your answer in cm)
Magnification = image size/ object size
image size = magnification x object size
Converting units:
100/1000=0.1
0.1/10=0.01
60x0.01=0.6 cm
