A certain type of lm requires an exposure time of 0.010 s
Chapter 25, Problem 25.7(choose chapter or problem)
A certain type of lm requires an exposure time of 0.010 s with an f/11 lens setting. Another type of lm requires twice the light energy to produce the same level of exposure. What f-stop does the second type of lm need with the 0.010-s exposure time?
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