MicroscopesThere are two types of microscopes: 1) Light compound
microscope uses light to view specimens 2) Electron microscope uses
electrons to view specimens
Light compound microscopeThe light compound microscope has two
lenses:- Objective lens: collects light passing through the
specimen and forms a magnified image- Ocular lens: collects the
magnified image from the objective lens and further magnifies this
image
Electron microscopeThere are two types of electron microscopes:-
Transmission microscope: electrons pass through the specimen-
Scanning microscope: electrons rebound off the specimenUsed to view
smaller structures in cells that cannot be seen with a light
microscope
The impact of technologyOngoing improvement of the light
compound microscope meant higher quality images of cellsThe
invention of electron microscopes (1933) led to the discovery of
smaller structures within cells which provided greater knowledge
and understandingImprovement in the preparation technique of
specimens for viewing eg the use of dyes
