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A cylindrical tank is 50.0 ft deep, 15.0 ft in diameter, and filled to the top...

A cylindrical tank is 50.0 ft deep, 15.0 ft in diameter, and filled to the top with water. A flashlight shines into the tank from above. What minimum angle φ can its beam make with the water surface if the beam is to illuminate part of the bottom? (n water = 1.33)

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