The apparent brightness B of a light source (measured in W/m2) is directly proportional to the luminosity L (measured in W) of the light source and inversely proportional to the square of the distance d from the light source (measured in meters). (a) Write an equation that expresses this variation. (b) If the distance is doubled, by what factor will the brightness change? (c) If the distance is cut in half and the luminosity is tripled, by what factor will the brightness change?

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