A certain kind of film requires an exposure time of 0010 s


A certain kind of film requires an exposure time of 0.010 s with anf / 12 lens setting. Another type of film requires quadruple the light energy to produce the same level of exposure. What f-number does the second type of film require with the0.010-s exposure time?

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Physics: A certain kind of film requires an exposure time of 0010 s
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