The exposure index EI for a 35-millimeter camera is a measurement of the amount of light that hits the film. It is determined by the
The exposure index EI for a 35-millimeter camera is a measurement of the amount of light that hits the film. It is determined by the equation 2 EI = 10g2 ([7), where f is the "fstop" setting on the camera and 1' is the exposure time in seconds. Suppose the fstop setting is 12 and the exposure time is 9 seconds. What will the resulting exposure index be? EI=
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