intensity of light from bulb is inversely proportional to the square f the distance s from the bulb. if i=90w/m^2 when the distance s=20m, find the itensity at a distance of 10cm/

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formula is .. i=k(1/s) right or not?

and
k=90x20
or k= 1800.. ?

and.. i sub 2 = 180 w/m^2?

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