After looking at cells under a microscope you may be asked to do a few calculations.
Below is the triangle you can use for your revision with the 3 equations needed. I always remember it as AIM!!
Actual image is the real size of the “thing” you are looking at (sometimes called The Object)
Image Size is the measurement, length/height/width, of the image you are looking at
Magnification is how magnified something is
You may need to do some unit conversions with your calculations.