Question

Step 1

Given,

The intensity I of light from a light bulb varies inversely as the square of the distance d from the light bulb.

Step 2

When I = 90w/m2 then d = 5 m.

So, 90 = k (5)

k = 18

Therefore, I = 18d

Again, when I = 40w/m2 then

...

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