paraxial approximation
paraxial approximation
"Paraxial approximation" is an approximation used in ray tracing of an electron beam where the angle between the electron beam and the optical axis is small. In other words, trigonometric functions of the angles appearing in ray optics are approximated by linear functions (ex. sin α → α) and optical surfaces are replaced by portions of a sphere. In the paraxial approximation, five Seidel aberrations do not appear.
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