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A beam of light is travelling through a ...

A beam of light is travelling through a room full of smoke. The source of light is also located in the room. The intensity of light `(I)` and the distance `(r)` from the source are related as :

A

`I prop r^2`

B

`I prop 1/r^2`

C

`I falls faster than 1/r^2`

D

`I falls slower than 1/r^2

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