The microscope

Microstructure

Detail of cells as viewed under a light microscope

Ultrastructure

Detail of cells or cell structures as seen using an electron microscope

Types of electron microscopes

• Scanning electron microscope (SEM)

• Transmission electron microscope (TEM)

SEM

Allows you to view the surface of the specimen

TEM

Allows you to view the internal structure of the specimen

Coarse adjustment wheel

For rough focusing

Fine adjustment wheel

For precise focusing

Clip

Holds the slide in place

Stage

Holds the slide

Condenser

Focuses light onto the slide

Eyepiece

Magnifies the image

Nosepiece

Allows you to move different objective lenses into place

Objective lens

Magnifies the image

Diaphragm

Controls the amount of light entering the slide

Calculating magnification, actual size, image size

Triangle with image size over actual size and magnification