When albert turns on his small desk lamp the light falling


When Albert turns on his small desk lamp, the light falling on his book has intensity Io. When this is not quite enough he turns the small lamp off and turns on a high intensity lamp so that the light on his book has intensity 4Io. What is the intensity of light falling on the book when Albert turns both lamps on? If there is more than one possibility, give the range of intensity possibilities.

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Physics: When albert turns on his small desk lamp the light falling
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