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In SEM, the image is formed by the electrons that _________________

(a) reflect back

(b) ionize

(c) undergo inversion

(d) pass through

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Right choice is (a) reflect back

To elaborate: Unlike in transmission electron microscopy (TEM) in which image is formed when the electrons pass through the sample, in case of scanning electron microscope the electrons are reflected back and that leads to the formation of an image.

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