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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 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 EI=log2 exposure time is 4 seconds. What will the resulting exposure index be? (+), where f is the "f-stop" setting on the camera and t is the exposure time in seconds. Suppose the f-stop setting is 8 and the

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