High-Diffusion Screens for Process Projection By Hugh McG. Roes I. Requirements of Translucent Screens One essential difference between front and back projection lies in the manner in which light leaves the screen and enters the lens of the camera or the eye, and to consider this we must imagine the film or slide removed from the projector and the blank screen illuminated. The distribution or unevenness of the brightness of the screen which is then seen will still be present when the picture is

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... superimposed upon it, In back projection very little light is reflected; most of it passes through the screen and is scattered to some extent. The effect is shown diagrammatically in Fig. 1. The angle between the incident ray and the Abstract by F. B. Ber er of a paper by Hugh McG. Ross, pubjished in