A reading light contains a dimmer switch that can vary its luminosity from 10 W to 100 W.If the device produces just the right amount of light when set to 10 W and held at a distance of 10 centimeters,to what value should you set the wattage if you hold it 20 centimeters away?

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The Answer of A reading light contains a dimmer switch that can vary its luminosity from 10 W to 100 W.If the device produces just the right amount of light when set to 10 W and held at a distance of 10 centimeters,to what value should you set the wattage if you hold it 20 centimeters away?

A Reading Light Contains a Dimmer Switch That Can Vary