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What is the method applied to reduce spherical aberration for electromagnetic lenses?

What is the method applied to reduce spherical aberration for electromagnetic lenses? Correct Answer Decreasing the aperture angle

In case of optical microscopy, chromatic and spherical aberrations are reduced by using combinations of concave and convex lens elements. But, for electromagnetic lens this method is not preferable. Instead the reduction in aperture angle, α, can decrease the aberration.

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