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![Light, photometry and illumination : a thoroughly revedof ''Electrical illuminating engineering'' . imaginary sphere. Evidently the density of the normalillumination against the inner surface of the sphere will bear tothe illumination of Light, photometry and illumination : a thoroughly revedof ''Electrical illuminating engineering'' . imaginary sphere. Evidently the density of the normalillumination against the inner surface of the sphere will bear tothe illumination of](https://c8.alamy.com/comp/2AM76W2/light-photometry-and-illumination-a-thoroughly-revedof-electrical-illuminating-engineering-imaginary-sphere-evidently-the-density-of-the-normalillumination-against-the-inner-surface-of-the-sphere-will-bear-tothe-illumination-of-the-circular-surface-source-the-inverse-ratio-ofthe-interior-area-of-the-exposed-zone-of-the-sphere-to-the-area-ofthe-lighting-source-since-the-lumens-produced-must-equal-thoseutilized-this-ratio-equals-the-square-of-the-ratio-of-the-radiusac-to-the-diagonal-ad-when-the-radius-of-the-circular-source-istaken-as-the-unit-of-length-for-the-measurement-of-all-d-2AM76W2.jpg)
Light, photometry and illumination : a thoroughly revedof ''Electrical illuminating engineering'' . imaginary sphere. Evidently the density of the normalillumination against the inner surface of the sphere will bear tothe illumination of
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