Image: From on-axis to off-axis illumination
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Description: Compared to on-axis illumination, where the illumination ray is along the optical axis (center of pupil represented by the circle), illumination that is further off-axis tends to reduce the contrast (max-min) but is the only way to resolve the smallest pitch.[1][2][3]
Title: From on-axis to off-axis illumination
Credit: Excel and PowerPoint
Author: Guiding light
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