You can calculate magnification:
magnification=size of image/size of real object
You can calculate the image size:
size of image=magnification x size of real object
You can calculate the real size:
size of real object=size of image/magnification.
Practice question
A student measures a human capillary of image size 5mm and magnification x1000.
What is the real size?
real size=size of image/magnification. real size=5/1000=0.005nanometres.
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