T

light I objective lens |

mirror introduced for direct viewing by eye projector lens image processing computer system light microscope display monitor condenser lens r electrons I objective lens image viewed directly electrons I objective lens image projected on fluorescent screen transmission electron microscope image processing computer system

display monitor (b)

electrons beam scanner detector beam scanner detector

scanning electron microscope

image processing computer system display monitor (c)

Figure 1.3. Basic design of light and electron microscopes.

Focussing system

Projector lenses (eyepieces)

Objective lens

Specimen holder Condenser lens

Light source Figure 1.4. Simple upright light microscope.

lens

Phase contrast microscopy

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