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The exposure index EI for a 35-millimeter camera is a measurement of the amount of light that hits the 2 film. It is determined by

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The exposure index EI for a 35-millimeter camera is a measurement of the amount of light that hits the 2 film. It is determined by the equation E1 = logz (T ), where f is the "f-stop" setting on the camera and 1' is the exposure time in seconds. Suppose the f-stop setting is 12 and the exposure time is 9 seconds. What will the resulting exposure index be? EI=

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