Mrs.Cullen/Pattinson
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A light source produces an illumination of 18 lumens per square meter at a distance of 3 m from the light source. The illumination 9 m from the source is
a)6
b)180
c)2
d)60
a)6
b)180
c)2
d)60
The illumination 9 m from the source is?
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