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A certain type of film requires an exposure
time of 0.011 s with an f/11 lens setting.
Another type of film requires twice the light
energy to produce the same level of exposure.
What f- stop does the second type of film
need with the 0.011 s exposure time? (Com-
mon f- stops are 1, 1.2, 1.4, 1.8, 2, 4, 8, 11)

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