Question

a transmission electron micro-scope image is formed by

Explanation:

Transmission electron microscopes (TEMs) use a focused beam of electrons that passes through a thin specimen. Interactions of the electrons with the sample (like scattering) create contrast, and magnetic lenses focus the transmitted electrons to form an image on a detector or fluorescent screen.

Answer:

A focused beam of electrons that has passed through a thin specimen, with the transmitted electrons focused by magnetic lenses to produce the image.