Abstract
Many optical experiments and applications require the use of devices called optical wedges which are thin-sheet optical modulators having a continuous, usually linear, change in optical density with either distance or angle. The optical density of a sample area on an optical wedge depends on the size and shape of the aperture and the characteristics of the wedge. The relationship of the effective density of the whole sample to the density at the center of the sample has been derived for wedges of rectilinear and circular form and sampling apertures in the form of rectangles, circles, and circular sectors. The theory has applications in the microdensitometry of photographic edges.
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