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2021-05-01 20:50:22
00:21:55
Urdu
what is electron microscope construction of electron microscope working principle of electron microscope Federal board Physics kpk board Physics physics lectures physics lectures in Urdu physics lectures in Hindi candle academy Pakistan chapter 18 physics 12 dawn of modern physics
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electron microscope @ candle academy Pakistan.
in lecture 13 of chapter 18 don of modern physics class 12 we have discuss the construction working principle and scope of electron microscope.
what is electron microscope?
electron microscope is a device in which electron beam is used instead of light because electrons have associated wavelength when they are moving with certain velocity.the wavelength of electron is hundred times shorter than the wavelength of ordinary light. therefore electron microscope can be used to observe the 100 times smaller objects.
construction and working of electron microscope
electron beam is generated by electron gun. this electron beam is focused through magnetic lenses. focused electron beam passes to the specimen. path of electron beam is reflected and part of it difrates through the specimen. this diffracted electron beam is received by the detector. and magnified image of the specimen is formed.
there are two types of electron microscope. scanning electron microscope and transmission electron microscope.
#scanningelectronmicroscope #transmissionelectronmicroscope
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