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(D) In an electron microscope,the electron beam is charged. Because electrons are charged particles,they can be deflected by magnetic fields. Therefor

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Magnetic lens

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(D) In an electron microscope,the electron beam is charged. Because electrons are charged particles,they can be deflected by magnetic fields. Therefore,magnetic lenses are used to control and focus the electron beam to form an image,as glass lenses (convex or concave) cannot focus electrons.

Which lenses in an electron microscope are used to control and focus an electron beam?

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