How long can the shutter of a photographic camera be open when filming a diving from a diving board? The moment of immersion in water is photographed. The height of the tower is 5 m. The photographer stands in the boat at a distance of 10 m from the place where the jumper dives. The camera lens has a focal length of 10 cm. An image blur of 0.5 mm is allowed on the negative.

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