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The electron optics consists of an electron gun followed by which of the following components?

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The electron optics consists of an electron gun followed by which of the following components?

(a) Collimator

(b) Slit

(c) Amplifier

(d) Electron beam probe

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Origin of the question is Electron Probe Microanalyser in section X-Ray Spectrometers of Analytical Instrumentation

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Right answer is (d) Electron beam probe

For explanation I would say: The electron optics consists of an electron gun followed by an electron beam probe. This is formed by two electro-magnetic lenses.

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