the object image on the ground glass of the camera when

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the object image on the ground glass of the camera when taking pictures from a distance of 8.5 m has a height of 13.5 mm and a distance of 2 meters - the height of 60 mm. Find the focal length of the lens.

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Task 40835. The solution formulas and the laws of recording used in the decision, drawing, calculation formula and the withdrawal response.
If you have any questions about the decision to write. I try to help.


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