Magnification in the electron microscope can be varied from hundreds to several hundred thousands of times.

This is done by varying the strength of the projector and intermediate lenses. Not all lenses will necessarily be used at lower magnifications.

Use the controls to change the magnification, and note the change in magnification of each lens, and how the size of the image changes. The original object size is 0.4 µm.

At a magnification of one million times how large is the area of the specimen which you could see at one time on the 100 mm square screen of the TEM?