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Well, i tried to do it my way.just help me out please!
First, you measure the length of the scale bar with ur ruler. say x mm.
So, x mm is equivalent to 2 micrometres
Then measure the length of the chloroplast using your ruler. Say y mm.
By proportion, y mm = (2 * y)/x micrometres. Say it is t micrometres
That's the size of the object (actual size)
Then see y mm is equivalent to how many micrometres. Say its z micrometres. This is the size of image
Magnification = size of image/actual size = t/z times
Try it and see if you got the answer.