Size and Its Units 1mm Magnification: 100µm the degree to which the size of an image is larger than the image itself. 10µm Resolution: the degree to which it's possible to distinguish two objects close together 1µm calculating linear magnification of an electron-micrograph using it's scale bar 1.measure the length of the scale bar in mm 1000nm 2. convert to μm. 3. M = Image size/Actual size calculating specimen size using magnification 1.measure the length of the image of the specimen in mm 2. convert to μm. 3. A = Image size/Magnification calculating specimen size using a scale bar 1.measure the length of the specimen in mm 10nm 2. measure the length of the scale bar in mm 3. divide specimen by scale length 4. multiply the scale bar by the last answer Eyepiece magnification x objective magnification = overall magnification 1nm *photos are screencaps by the video Powers of Ten™ (1977) by Eam Office, depicting skin cell, tissues, capillary, white cell nucleus, double helix molecule and bonded atoms.