8. In the white paper area S = 20 × 30 cm 2 perpen

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8. In the white paper area S = 20 × 30 cm 2 perpendicular to the incident light flux F = 120 lm. Find the illumination E, R luminosity and brightness to the paper sheet, if the reflection coefficient ρ = 0,75.

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Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)

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