Abstract

An expression is developed for the radiance of the sphere wall as a function of the incident flux F0, the reflectance R, and the ratio α of the remaining sphere-wall area to the total area of the sphere. The theory holds for the limiting cases α→1 and α→0. Excellent agreement was found by experiment among several determinations of absolute reflectance for widely different values of α.

© 1958 Optical Society of America

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