Question

with a ray diagram , the working of a transmission electron microscope​

Answer 1

Answer:

Ray diagrams showing the important optical elements for (a) conventional transmission electron microscopy (CTEM) and (b) scanning transmission electron microscopy (STEM). The CTEM image is obtained in parallel; the STEM image is obtained pixel-by-pixel by scanning the probe. The diagrams are shown with the electron source at the top for CTEM and at the bottom for STEM, to show the reciprocal nature of the optical paths. STEM also provides simultaneous annular dark-field imaging. Actual microscopes have several additional lenses, and the beam-limiting aperture positions may differ.