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Calculating magnification

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This is a very simple question, and I think my brain is just being stupid right now, but I have just started revising for biology and the way that the IB textbook teaches how to calculate linear magnification of drawings is very confusing to me.

Could someone please explain to me how to calculate the magnification of a drawing? Both converting a given magnification to a scale bar, and scale bar to magnification would be nice ^_^ , thanks.

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[b]Calculate linear magnification of drawings.[/b]
Drawings should show cells and cell ultrastructure.
A scale bar: |------| = 1 µm
Magnification: ×250
To calculate magnification:
Magnification = Measured Size of Diagram ÷ Actual Size of Object

got this from [url="http://en.wikibooks.org/wiki/IB_Biology_Study_Guide#Calculate_linear_magnification_of_drawings"]http://en.wikibooks.org/wiki/IB_Biology_St...ion_of_drawings[/url]..

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