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191104ElectronMicroscope

191104ElectronMicroscope - Aims Resolvingpower &electron...

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AS Biology  Core Principles The Electron Microscope
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Aims Resolving power The resolving power of light & electron  microscopes The difference between the light &  electron microscope Transmission & scanning electron  microscopy
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Introduction Microscopes magnify & resolve images Microscopy began in 1665 when Robert  Hooke coined the word ‘cells’ to describe the  structure of cork You need to know about 2 types of  microscope - light & electron You need to know how they work and the  differences between them ‘Its not how much they magnify that is key -  but how well they resolve…’
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Resolving Power The limit of resolution of a microscope is the  smallest distance between 2 points that can  be seen using a microscope This is a measure of the clarity of the image A microscope with a high resolving power will  allow 2 small objects which are close together  to be seen as 2 distinct objects
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