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Measurements of the efficiency factor K under rigorously controlled experimental conditions are reported for nine monodisperse suspensions of latex spheres in water for the wavelength range in air from 0·38 to 0·63 μm. These show good agreement in the range x = 0-30 with Irvine's computations from Mie's theory for m = 1·2, but the effect of optical dispersion on the ( K, x ) curve is significant. Secondary oscillation (ripple) has been detected in the K value for x values in the range 25-28.
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Hepplestone et al. (1967) studied this question.
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