compound light microscope
DESCRIPTION
Compound Light Microscope. Uses two lenses and has a light source Ocular lens usually magnifies x10 Can be used to view living cells Highest magnification of a compound light microscope is 2,000x. Electron Microscope. Beam of electrons produce an enlarged image of specimen - PowerPoint PPT PresentationTRANSCRIPT
Compound Light Microscope•Uses two lenses and has a light source
•Ocular lens usually magnifies x10
•Can be used to view living cells
•Highest magnification of a compound light microscope is 2,000x
Electron Microscope• Beam of electrons produce an enlarged image of specimen
•Highest magnification of an electron microscope is 200,000x
• Cannot be used to view living cells
Scanning Electron Microscope
•Electron beam is focused on a specimen coated with a very thin layer of metal
•Electrons that bounce off form an image on a fluorescent screen
•Show 3-D images of cell surfaces
•Black and white images only (artificial colors sometimes added)
Transmission Electron Microscope•An electron beam is directed at a very thin slice of a specimen stained with metal ions
•Electrons passing through the specimen strike a fluorescent screen, forming an image
•The formed image can show the internal structure of a cell in fine detail
•Black and white images only (artificial colors sometimes added)