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Which of the following lenses are used for refocussing the electrons in EBM process?

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in Advanced Machining by (962k points)
Which of the following lenses are used for refocussing the electrons in EBM process?

(a) Magnetic lens

(b) Electronic lens

(c) Magnetic & Electronic lens

(d) None of the mentioned

This question was posed to me in a job interview.

My question comes from Electronbeam Machining-Introduction, Equipment and Material removal topic in portion Thermal Processes of Advanced Machining

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Best answer
The correct choice is (c) Magnetic & Electronic lens

Easy explanation: Magnetic and electronic lenses are used to refocus the electrons in EBM process.

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