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A Spherical Mask to Compensate for cos3 and cos4 Illuminance Variation

J. J. De Palma and R. D. Pickering

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Abstract

A dyed or pigmented gelatin mask cast in a shallow spherical mold cavity can provide excellent compensation for the cos3α or cos4α fall-off of illuminance on a flat surface. Computed data are shown for the imperfection of correction under a variety of geometric conditions, and some typical applications are described.

© 1966 Optical Society of America

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