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Which of the following component of TEM focuses the beam of electrons on the sample?

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Which of the following component of TEM focuses the beam of electrons on the sample?

(a) ocular lens

(b) condenser lens

(c) stage

(d) column
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Right option is (b) condenser lens

Easiest explanation: The condenser lens focuses the electron beam on to the specimen, in case of transmission electron microscope. The specimen is supported on the grid holder and placed inside the column.
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