To read, to straining your eyes, it is necessary

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To read, to straining your eyes, it is necessary illumination in white light is 100 lux. What is the intensity of pressure on the page of a book the size of 15 * 25 cm 2 is created in this case? Determine the total mass of photons absorbed per page of 1 min. The reflection coefficient of 0.25 pages take.

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Task 50276. Detailed solution with a short recording conditions, laws and formulas used in the decision, the withdrawal of the calculation formula and the answer.
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