Subject length of 8 cm is projected onto the screen

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Uploaded: 06.03.2016
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Description

Subject length of 8 cm is projected onto the screen. What is the focal length of the lens must be located at a distance of 4 meters from the screen to the subject of the image on the screen was 2 m long?

Additional information

Task 40813. 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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