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Asked by Clarissa

The brightness of a light source at a distance of 100m from the source is 40 units. What would be the brightness if the distance is reduced to 50m?
11 years ago

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Answered by bobpursley
4x or 160units
11 years ago
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The brightness of a light source at a distance of 100m from the source is 40 units. What would be the brightness if the distance is reduced to 50m?

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