Question: The f-number lens setting of a camera varies directly as the square root of the time t that the film is exposed. If the f-number

The f-number lens setting of a camera varies directly as the square root of the time t that the film is exposed. If the f-number is 8 (written as f/8) for t = 0.0200 s, find the f-number for t = 0.0098 s.

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