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It is required to examine a fractured component in the SEM at a magnification of 1000x and to achieve a depth of field of 1

It is required to examine a fractured component in the SEM at a magnification of 1000x and to achieve a depth of field of 1 mm. If the maximum working distance that can be used is 50mm, what is the maximum sized objective aperture that can be used?

Answer is 20 um and equation is h = (0.2WD)/(AM) mm

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