What is the magnification of microscope? Is it the multiple of length or area? Or what does it mean? If a carbon particle is magnified 600 times under a microscope, what does it mean?

The multiple of the length, or the magnification of the imaging angle of the object at a distance of 25 cm (corresponding to the multiple of the length on the retina);
Under the microscope, the magnification of 600 times is 600 times higher than that of imaging angle (corresponding to the length of retina) at a distance of 25 cm

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