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Abstract
A formula is developed from elementary diffraction theory for the intensity and distribution of the diffused light from a developed photographic emulsion layer, and calculations are given of the resulting relation between diffuse and specular densities, The experimental results show that the theory gives a useful general picture of the behaviour of developed emulsion layers. The uneven surface of the layer, however, has a marked effect on measurements of specular density, and so of the Callier coefficient.