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7 March, 00:36

If a 72-candela light source is located at a distance of 3 meters from a surface, the illuminance on the surface is

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  1. 7 March, 03:17
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    To calculate illuminance we use the formula: E=I/s ².

    E = illuminance (in lux),

    I = intensity of the light (in candelas)

    s = distance from the light source (in meters).

    E = 72/9 = 8 lux
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