The width of the frame window and the movie camera

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The width of the frame window and the movie camera = 1.2 cm wide screen L = 2,5 m. The screen illumination must be at least E = 4.5 lux. Determine the minimum illumination staffing movie camera window.

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Task 40931. 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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